9+9-x=11

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Solution for 9+9-x=11 equation: 


Simplifying
9 + 9 + -1x = 11

Combine like terms: 9 + 9 = 18
18 + -1x = 11

Solving
18 + -1x = 11

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + -1x = 11 + -18

Combine like terms: 18 + -18 = 0
0 + -1x = 11 + -18
-1x = 11 + -18

Combine like terms: 11 + -18 = -7
-1x = -7

Divide each side by '-1'.
x = 7

Simplifying
x = 7

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