3x+42=x+15

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Solution for 3x+42=x+15 equation:


Simplifying
3x + 42 = x + 15

Reorder the terms:
42 + 3x = x + 15

Reorder the terms:
42 + 3x = 15 + x

Solving
42 + 3x = 15 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
42 + 3x + -1x = 15 + x + -1x

Combine like terms: 3x + -1x = 2x
42 + 2x = 15 + x + -1x

Combine like terms: x + -1x = 0
42 + 2x = 15 + 0
42 + 2x = 15

Add '-42' to each side of the equation.
42 + -42 + 2x = 15 + -42

Combine like terms: 42 + -42 = 0
0 + 2x = 15 + -42
2x = 15 + -42

Combine like terms: 15 + -42 = -27
2x = -27

Divide each side by '2'.
x = -13.5

Simplifying
x = -13.5

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