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18+18+x+x=0
We simplify the equation to the form, which is simple to understand
18+18+x+x=0
We move all terms containing x to the left and all other terms to the right.
+1x+1x=0-18-18
We simplify left and right side of the equation.
+2x=-36
We divide both sides of the equation by 2 to get x.
x=-18
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