40-x=12+3x

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


Simplifying
40 + -1x = 12 + 3x

Solving
40 + -1x = 12 + 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.
40 + -1x + -3x = 12 + 3x + -3x

Combine like terms: -1x + -3x = -4x
40 + -4x = 12 + 3x + -3x

Combine like terms: 3x + -3x = 0
40 + -4x = 12 + 0
40 + -4x = 12

Add '-40' to each side of the equation.
40 + -40 + -4x = 12 + -40

Combine like terms: 40 + -40 = 0
0 + -4x = 12 + -40
-4x = 12 + -40

Combine like terms: 12 + -40 = -28
-4x = -28

Divide each side by '-4'.
x = 7

Simplifying
x = 7

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