9x+12-x-5-7x=20

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Solution for 9x+12-x-5-7x=20 equation:


Simplifying
9x + 12 + -1x + -5 + -7x = 20

Reorder the terms:
12 + -5 + 9x + -1x + -7x = 20

Combine like terms: 12 + -5 = 7
7 + 9x + -1x + -7x = 20

Combine like terms: 9x + -1x = 8x
7 + 8x + -7x = 20

Combine like terms: 8x + -7x = 1x
7 + 1x = 20

Solving
7 + 1x = 20

Solving for variable 'x'.

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

Add '-7' to each side of the equation.
7 + -7 + 1x = 20 + -7

Combine like terms: 7 + -7 = 0
0 + 1x = 20 + -7
1x = 20 + -7

Combine like terms: 20 + -7 = 13
1x = 13

Divide each side by '1'.
x = 13

Simplifying
x = 13

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