Question

А) 7х+2-3х+10=0 б)5х-8-(3х-8)=0 в) 3х-1-(2х+5-х)=0 г) 1,52-2,8х-(3-2х+х)=0 д) 5х+7-2х-(3-2х+х)=0 е) 8-0,2х-(21,28-1,6)=0

Answer 1

А) 4x=-12
     x=-3
б)2x=0
    x=0
в)2x=6
    x=3
г)0,8x=-1,48
    x=-1,85
д)4x=-4
    x=-1
е)0,2x=11,68
   x=58,4

Answer 2

Let's solve each of the given equations step by step:

a) 7x + 2 - 3x + 10 = 0 Combining like terms, we have: (7x - 3x) + (2 + 10) = 0 4x + 12 = 0 Subtracting 12 from both sides: 4x = -12 Dividing both sides by 4: x = -3

b) 5x - 8 - (3x - 8) = 0 Distributing the negative sign inside the parentheses, we have: 5x - 8 - 3x + 8 = 0 (5x - 3x) + (-8 + 8) = 0 2x + 0 = 0 2x = 0 x = 0

c) 3x - 1 - (2x + 5 - x) = 0 Simplifying the expression inside the parentheses: 3x - 1 - (2x + 5 - x) = 0 3x - 1 - 2x - 5 + x = 0 (3x - 2x + x) + (-1 - 5) = 0 2x - 6 = 0 Adding 6 to both sides: 2x = 6 Dividing both sides by 2: x = 3

d) 1.52 - 2.8x - (3 - 2x + x) = 0 Simplifying the expression inside the parentheses: 1.52 - 2.8x - (3 - 2x + x) = 0 1.52 - 2.8x - 3 + 2x - x = 0 (2x - 2.8x - x) + (1.52 - 3) = 0 -x - 1.48 = 0 Adding 1.48 to both sides: -x = 1.48 Multiplying both sides by -1 (to solve for x): x = -1.48

e) 5x + 7 - 2x - (3 - 2x + x) = 0 Simplifying the expression inside the parentheses: 5x + 7 - 2x - (3 - 2x + x) = 0 5x + 7 - 2x - 3 + 2x - x = 0 (5x - 2x + 2x - x) + (7 - 3) = 0 4x + 4 = 0 Subtracting 4 from both sides: 4x = -4 Dividing both sides by 4: x = -1

f) 8 - 0.2x - (21.28 - 1.6) = 0 Simplifying the expression inside the parentheses: 8 - 0.2x - (21.28 - 1.6) = 0 8 - 0.2x - 21.28 + 1.6 = 0 (-0.2x) + (8 + 1.6 - 21.28) = 0 -0.2x - 11.68 = 0 Adding 11.68 to both sides: -0.2x = 11.68 Dividing both sides by -0.2: x = -58.4

The solutions to the given equations are: a) x = -3