8x+7-5x=7x-21

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Solution for 8x+7-5x=7x-21 equation:


Simplifying
8x + 7 + -5x = 7x + -21

Reorder the terms:
7 + 8x + -5x = 7x + -21

Combine like terms: 8x + -5x = 3x
7 + 3x = 7x + -21

Reorder the terms:
7 + 3x = -21 + 7x

Solving
7 + 3x = -21 + 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.
7 + 3x + -7x = -21 + 7x + -7x

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

Combine like terms: 7x + -7x = 0
7 + -4x = -21 + 0
7 + -4x = -21

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

Combine like terms: 7 + -7 = 0
0 + -4x = -21 + -7
-4x = -21 + -7

Combine like terms: -21 + -7 = -28
-4x = -28

Divide each side by '-4'.
x = 7

Simplifying
x = 7

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