3x+7-x+12=45

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Solution for 3x+7-x+12=45 equation:


Simplifying
3x + 7 + -1x + 12 = 45

Reorder the terms:
7 + 12 + 3x + -1x = 45

Combine like terms: 7 + 12 = 19
19 + 3x + -1x = 45

Combine like terms: 3x + -1x = 2x
19 + 2x = 45

Solving
19 + 2x = 45

Solving for variable 'x'.

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

Add '-19' to each side of the equation.
19 + -19 + 2x = 45 + -19

Combine like terms: 19 + -19 = 0
0 + 2x = 45 + -19
2x = 45 + -19

Combine like terms: 45 + -19 = 26
2x = 26

Divide each side by '2'.
x = 13

Simplifying
x = 13

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