2x-21=15-7x

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Solution for 2x-21=15-7x equation:


Simplifying
2x + -21 = 15 + -7x

Reorder the terms:
-21 + 2x = 15 + -7x

Solving
-21 + 2x = 15 + -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 + 2x + 7x = 15 + -7x + 7x

Combine like terms: 2x + 7x = 9x
-21 + 9x = 15 + -7x + 7x

Combine like terms: -7x + 7x = 0
-21 + 9x = 15 + 0
-21 + 9x = 15

Add '21' to each side of the equation.
-21 + 21 + 9x = 15 + 21

Combine like terms: -21 + 21 = 0
0 + 9x = 15 + 21
9x = 15 + 21

Combine like terms: 15 + 21 = 36
9x = 36

Divide each side by '9'.
x = 4

Simplifying
x = 4

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