3x+42=12x-40

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Solution for 3x+42=12x-40 equation:


Simplifying
3x + 42 = 12x + -40

Reorder the terms:
42 + 3x = 12x + -40

Reorder the terms:
42 + 3x = -40 + 12x

Solving
42 + 3x = -40 + 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.
42 + 3x + -12x = -40 + 12x + -12x

Combine like terms: 3x + -12x = -9x
42 + -9x = -40 + 12x + -12x

Combine like terms: 12x + -12x = 0
42 + -9x = -40 + 0
42 + -9x = -40

Add '-42' to each side of the equation.
42 + -42 + -9x = -40 + -42

Combine like terms: 42 + -42 = 0
0 + -9x = -40 + -42
-9x = -40 + -42

Combine like terms: -40 + -42 = -82
-9x = -82

Divide each side by '-9'.
x = 9.111111111

Simplifying
x = 9.111111111

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