42+x=81-2x

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Solution for 42+x=81-2x equation:


Simplifying
42 + x = 81 + -2x

Solving
42 + x = 81 + -2x

Solving for variable 'x'.

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

Add '2x' to each side of the equation.
42 + x + 2x = 81 + -2x + 2x

Combine like terms: x + 2x = 3x
42 + 3x = 81 + -2x + 2x

Combine like terms: -2x + 2x = 0
42 + 3x = 81 + 0
42 + 3x = 81

Add '-42' to each side of the equation.
42 + -42 + 3x = 81 + -42

Combine like terms: 42 + -42 = 0
0 + 3x = 81 + -42
3x = 81 + -42

Combine like terms: 81 + -42 = 39
3x = 39

Divide each side by '3'.
x = 13

Simplifying
x = 13

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