2x-9=-8x+21

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Solution for 2x-9=-8x+21 equation:


Simplifying
2x + -9 = -8x + 21

Reorder the terms:
-9 + 2x = -8x + 21

Reorder the terms:
-9 + 2x = 21 + -8x

Solving
-9 + 2x = 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.
-9 + 2x + 8x = 21 + -8x + 8x

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

Combine like terms: -8x + 8x = 0
-9 + 10x = 21 + 0
-9 + 10x = 21

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

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

Combine like terms: 21 + 9 = 30
10x = 30

Divide each side by '10'.
x = 3

Simplifying
x = 3

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