Question

2(3х+1)-8=3х-7 15-(-3)=2+(7х-20) 6-4+2х/6=2-х/2

Answer 1

Ответ:

$- \frac {1}{3}$

$5 \frac{1}{7}$

$\frac{4}{5}$

Answer 2

Let's solve each equation step by step:

1. 2(3x+1) - 8 = 3x - 7

   First, distribute the 2 on the left side of the equation:

   6x + 2 - 8 = 3x - 7

   Now, combine like terms:

   6x - 6 = 3x - 7

   To isolate the variable x, you can subtract 3x from both sides of the equation:

   6x - 3x - 6 = -7

   Simplify:

   3x - 6 = -7

   Now, add 6 to both sides to isolate x:

   3x - 6 + 6 = -7 + 6

   3x = -1

   Finally, divide by 3 to find the value of x:

   3x/3 = -1/3

   x = -1/3

2. 15 - (-3) = 2 + (7x - 20)

   First, simplify the expressions within the parentheses:

   15 + 3 = 2 + (7x - 20)

   18 = 2 + (7x - 20)

   Now, subtract 2 from both sides to isolate the expression with x:

   18 - 2 = 7x - 20

   16 = 7x - 20

   Add 20 to both sides to isolate 7x:

   16 + 20 = 7x

   36 = 7x

   Finally, divide by 7 to find the value of x:

   36/7 = x

   x ≈ 5.14 (rounded to two decimal places)

3. 6 - 4 + (2x/6) = 2 - (x/2)

   First, simplify within the parentheses and combine like terms:

   2 + (2x/6) = 2 - (x/2)

   Simplify further by multiplying both sides by 6 to get rid of the fractions:

   6(2 + 2x/6) = 6(2 - x/2)

   12 + 2x = 12 - 3x

   Now, isolate x by adding 3x to both sides:

   2x + 3x = 12 - 12

   5x = 0

   Finally, divide by 5 to find the value of x:

   5x/5 = 0/5

   x = 0