30+9x=x+21

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Solution for 30+9x=x+21 equation:


Simplifying
30 + 9x = x + 21

Reorder the terms:
30 + 9x = 21 + x

Solving
30 + 9x = 21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
30 + 9x + -1x = 21 + x + -1x

Combine like terms: 9x + -1x = 8x
30 + 8x = 21 + x + -1x

Combine like terms: x + -1x = 0
30 + 8x = 21 + 0
30 + 8x = 21

Add '-30' to each side of the equation.
30 + -30 + 8x = 21 + -30

Combine like terms: 30 + -30 = 0
0 + 8x = 21 + -30
8x = 21 + -30

Combine like terms: 21 + -30 = -9
8x = -9

Divide each side by '8'.
x = -1.125

Simplifying
x = -1.125

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