18=-9-x

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Solution for 18=-9-x equation:


Simplifying
18 = -9 + -1x

Solving
18 = -9 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
18 + x = -9 + -1x + x

Combine like terms: -1x + x = 0
18 + x = -9 + 0
18 + x = -9

Add '-18' to each side of the equation.
18 + -18 + x = -9 + -18

Combine like terms: 18 + -18 = 0
0 + x = -9 + -18
x = -9 + -18

Combine like terms: -9 + -18 = -27
x = -27

Simplifying
x = -27

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