3x+39=12x+42

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Solution for 3x+39=12x+42 equation:


Simplifying
3x + 39 = 12x + 42

Reorder the terms:
39 + 3x = 12x + 42

Reorder the terms:
39 + 3x = 42 + 12x

Solving
39 + 3x = 42 + 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
39 + 3x + -12x = 42 + 12x + -12x

Combine like terms: 3x + -12x = -9x
39 + -9x = 42 + 12x + -12x

Combine like terms: 12x + -12x = 0
39 + -9x = 42 + 0
39 + -9x = 42

Add '-39' to each side of the equation.
39 + -39 + -9x = 42 + -39

Combine like terms: 39 + -39 = 0
0 + -9x = 42 + -39
-9x = 42 + -39

Combine like terms: 42 + -39 = 3
-9x = 3

Divide each side by '-9'.
x = -0.3333333333

Simplifying
x = -0.3333333333

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