5x-21=x+7

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


Simplifying
5x + -21 = x + 7

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

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

Solving
-21 + 5x = 7 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-21 + 5x + -1x = 7 + x + -1x

Combine like terms: 5x + -1x = 4x
-21 + 4x = 7 + x + -1x

Combine like terms: x + -1x = 0
-21 + 4x = 7 + 0
-21 + 4x = 7

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

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

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

Divide each side by '4'.
x = 7

Simplifying
x = 7

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