8x+9=10x-21

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Solution for 8x+9=10x-21 equation:


Simplifying
8x + 9 = 10x + -21

Reorder the terms:
9 + 8x = 10x + -21

Reorder the terms:
9 + 8x = -21 + 10x

Solving
9 + 8x = -21 + 10x

Solving for variable 'x'.

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

Add '-10x' to each side of the equation.
9 + 8x + -10x = -21 + 10x + -10x

Combine like terms: 8x + -10x = -2x
9 + -2x = -21 + 10x + -10x

Combine like terms: 10x + -10x = 0
9 + -2x = -21 + 0
9 + -2x = -21

Add '-9' to each side of the equation.
9 + -9 + -2x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -2x = -21 + -9
-2x = -21 + -9

Combine like terms: -21 + -9 = -30
-2x = -30

Divide each side by '-2'.
x = 15

Simplifying
x = 15

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