30-18=2x-9

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Solution for 30-18=2x-9 equation:


Simplifying
30 + -18 = 2x + -9

Combine like terms: 30 + -18 = 12
12 = 2x + -9

Reorder the terms:
12 = -9 + 2x

Solving
12 = -9 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
12 + -2x = -9 + 2x + -2x

Combine like terms: 2x + -2x = 0
12 + -2x = -9 + 0
12 + -2x = -9

Add '-12' to each side of the equation.
12 + -12 + -2x = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -2x = -9 + -12
-2x = -9 + -12

Combine like terms: -9 + -12 = -21
-2x = -21

Divide each side by '-2'.
x = 10.5

Simplifying
x = 10.5

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