x+(12-x)+(15-x)+4=20

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Solution for x+(12-x)+(15-x)+4=20 equation:


Simplifying
x + (12 + -1x) + (15 + -1x) + 4 = 20

Remove parenthesis around (12 + -1x)
x + 12 + -1x + (15 + -1x) + 4 = 20

Remove parenthesis around (15 + -1x)
x + 12 + -1x + 15 + -1x + 4 = 20

Reorder the terms:
12 + 15 + 4 + x + -1x + -1x = 20

Combine like terms: 12 + 15 = 27
27 + 4 + x + -1x + -1x = 20

Combine like terms: 27 + 4 = 31
31 + x + -1x + -1x = 20

Combine like terms: x + -1x = 0
31 + 0 + -1x = 20
31 + -1x = 20

Solving
31 + -1x = 20

Solving for variable 'x'.

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

Add '-31' to each side of the equation.
31 + -31 + -1x = 20 + -31

Combine like terms: 31 + -31 = 0
0 + -1x = 20 + -31
-1x = 20 + -31

Combine like terms: 20 + -31 = -11
-1x = -11

Divide each side by '-1'.
x = 11

Simplifying
x = 11

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