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

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Solution for 3(x-7)-7x=-7(x-7)+20 equation:


Simplifying
3(x + -7) + -7x = -7(x + -7) + 20

Reorder the terms:
3(-7 + x) + -7x = -7(x + -7) + 20
(-7 * 3 + x * 3) + -7x = -7(x + -7) + 20
(-21 + 3x) + -7x = -7(x + -7) + 20

Combine like terms: 3x + -7x = -4x
-21 + -4x = -7(x + -7) + 20

Reorder the terms:
-21 + -4x = -7(-7 + x) + 20
-21 + -4x = (-7 * -7 + x * -7) + 20
-21 + -4x = (49 + -7x) + 20

Reorder the terms:
-21 + -4x = 49 + 20 + -7x

Combine like terms: 49 + 20 = 69
-21 + -4x = 69 + -7x

Solving
-21 + -4x = 69 + -7x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7x' to each side of the equation.
-21 + -4x + 7x = 69 + -7x + 7x

Combine like terms: -4x + 7x = 3x
-21 + 3x = 69 + -7x + 7x

Combine like terms: -7x + 7x = 0
-21 + 3x = 69 + 0
-21 + 3x = 69

Add '21' to each side of the equation.
-21 + 21 + 3x = 69 + 21

Combine like terms: -21 + 21 = 0
0 + 3x = 69 + 21
3x = 69 + 21

Combine like terms: 69 + 21 = 90
3x = 90

Divide each side by '3'.
x = 30

Simplifying
x = 30

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