x+11+x+9=12

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Solution for x+11+x+9=12 equation:


Simplifying
x + 11 + x + 9 = 12

Reorder the terms:
11 + 9 + x + x = 12

Combine like terms: 11 + 9 = 20
20 + x + x = 12

Combine like terms: x + x = 2x
20 + 2x = 12

Solving
20 + 2x = 12

Solving for variable 'x'.

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

Add '-20' to each side of the equation.
20 + -20 + 2x = 12 + -20

Combine like terms: 20 + -20 = 0
0 + 2x = 12 + -20
2x = 12 + -20

Combine like terms: 12 + -20 = -8
2x = -8

Divide each side by '2'.
x = -4

Simplifying
x = -4

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