10x=9x-21

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Solution for 10x=9x-21 equation: 


Simplifying
10x = 9x + -21

Reorder the terms:
10x = -21 + 9x

Solving
10x = -21 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
10x + -9x = -21 + 9x + -9x

Combine like terms: 10x + -9x = 1x
1x = -21 + 9x + -9x

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

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

Simplifying
x = -21

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