-9-9=x

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Solution for -9-9=x equation:


Simplifying
-9 + -9 = x

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

Solving
-18 = x

Solving for variable 'x'.

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

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

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

Add '18' to each side of the equation.
-18 + 18 + -1x = 0 + 18

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

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

Divide each side by '-1'.
x = -18

Simplifying
x = -18

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