9x-21=-9+8x

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Solution for 9x-21=-9+8x equation:


Simplifying
9x + -21 = -9 + 8x

Reorder the terms:
-21 + 9x = -9 + 8x

Solving
-21 + 9x = -9 + 8x

Solving for variable 'x'.

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

Add '-8x' to each side of the equation.
-21 + 9x + -8x = -9 + 8x + -8x

Combine like terms: 9x + -8x = 1x
-21 + 1x = -9 + 8x + -8x

Combine like terms: 8x + -8x = 0
-21 + 1x = -9 + 0
-21 + 1x = -9

Add '21' to each side of the equation.
-21 + 21 + 1x = -9 + 21

Combine like terms: -21 + 21 = 0
0 + 1x = -9 + 21
1x = -9 + 21

Combine like terms: -9 + 21 = 12
1x = 12

Divide each side by '1'.
x = 12

Simplifying
x = 12

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