9x=8x-21

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Solution for 9x=8x-21 equation: 


Simplifying
9x = 8x + -21

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

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

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

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

Divide each side by '1'.
x = -21

Simplifying
x = -21

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