x+3+x-9=18

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Solution for x+3+x-9=18 equation:


Simplifying
x + 3 + x + -9 = 18

Reorder the terms:
3 + -9 + x + x = 18

Combine like terms: 3 + -9 = -6
-6 + x + x = 18

Combine like terms: x + x = 2x
-6 + 2x = 18

Solving
-6 + 2x = 18

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + 2x = 18 + 6

Combine like terms: -6 + 6 = 0
0 + 2x = 18 + 6
2x = 18 + 6

Combine like terms: 18 + 6 = 24
2x = 24

Divide each side by '2'.
x = 12

Simplifying
x = 12

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