12+x=3(x+3)

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Solution for 12+x=3(x+3) equation:


Simplifying
12 + x = 3(x + 3)

Reorder the terms:
12 + x = 3(3 + x)
12 + x = (3 * 3 + x * 3)
12 + x = (9 + 3x)

Solving
12 + x = 9 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
12 + x + -3x = 9 + 3x + -3x

Combine like terms: x + -3x = -2x
12 + -2x = 9 + 3x + -3x

Combine like terms: 3x + -3x = 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 = -3
-2x = -3

Divide each side by '-2'.
x = 1.5

Simplifying
x = 1.5

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