x+(7-x)+(8-x)=12

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Solution for x+(7-x)+(8-x)=12 equation:


Simplifying
x + (7 + -1x) + (8 + -1x) = 12

Remove parenthesis around (7 + -1x)
x + 7 + -1x + (8 + -1x) = 12

Remove parenthesis around (8 + -1x)
x + 7 + -1x + 8 + -1x = 12

Reorder the terms:
7 + 8 + x + -1x + -1x = 12

Combine like terms: 7 + 8 = 15
15 + x + -1x + -1x = 12

Combine like terms: x + -1x = 0
15 + 0 + -1x = 12
15 + -1x = 12

Solving
15 + -1x = 12

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -1x = 12 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = 12 + -15
-1x = 12 + -15

Combine like terms: 12 + -15 = -3
-1x = -3

Divide each side by '-1'.
x = 3

Simplifying
x = 3

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