Question

А)5x-5,2=2,9+4x= Б)7x-(2x+6)=5x-4= В)7x-(3+2x)=3(3x-1)=

Answer 1

$5x - 5.2 = 2.9 + 4x \\5x - 4x = 2.9 + 5.2 \\ \: \: \:x = 8.1$

$7x-(2x+6)=5x-4 \\7x-2x - 6=5x-4 \\7x - 2x - 5x = 6 - 4 \\0 = 2 - корней \: нет$

$7x - (3 + 2x) = 3(3x - 1) \\7x - 3 - 2x = 9x - 3 \\7x - 2x - 9x = 3 - 3 \\ - 4x = 0 \\ x = 0$

Answer 2

It appears that you've provided three different equations labeled A, B, and C. To help you solve these equations, I'll provide the step-by-step solutions for each of them:

A) 5x - 5.2 = 2.9 + 4x

Step 1: Combine like terms on both sides of the equation. 5x - 4x = 2.9 + 5.2

Step 2: Simplify both sides further. x = 8.1

So the solution for equation A is x = 8.1.

B) 7x - (2x + 6) = 5x - 4

Step 1: Distribute the negative sign to the terms inside the parentheses. 7x - 2x - 6 = 5x - 4

Step 2: Combine like terms on both sides of the equation. 5x - 6 = 5x - 4

Step 3: Move the variable terms to one side and the constant terms to the other side to isolate x. 5x - 5x = 4 - 6

Step 4: Simplify further. 0 = -2

The equation 0 = -2 is a contradiction, which means there is no solution for equation B.

C) 7x - (3 + 2x) = 3(3x - 1)

Step 1: Distribute the negative sign to the terms inside the parentheses on the left side of the equation and distribute 3 to the terms inside the parentheses on the right side. 7x - 3 - 2x = 9x - 3

Step 2: Combine like terms on both sides of the equation. 7x - 2x - 3 = 9x - 3

Step 3: Move the variable terms to one side and the constant terms to the other side to isolate x. 7x - 2x - 9x = 3 - 3

Step 4: Simplify further. -4x = 0

Step 5: Solve for x by dividing both sides by -4. x = 0

So the solution for equation C is x = 0.

In summary: A) x = 8.1 B) No solution C) x = 0