3x-15=x+9

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Solution for 3x-15=x+9 equation:


Simplifying
3x + -15 = x + 9

Reorder the terms:
-15 + 3x = x + 9

Reorder the terms:
-15 + 3x = 9 + x

Solving
-15 + 3x = 9 + 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.
-15 + 3x + -1x = 9 + x + -1x

Combine like terms: 3x + -1x = 2x
-15 + 2x = 9 + x + -1x

Combine like terms: x + -1x = 0
-15 + 2x = 9 + 0
-15 + 2x = 9

Add '15' to each side of the equation.
-15 + 15 + 2x = 9 + 15

Combine like terms: -15 + 15 = 0
0 + 2x = 9 + 15
2x = 9 + 15

Combine like terms: 9 + 15 = 24
2x = 24

Divide each side by '2'.
x = 12

Simplifying
x = 12

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