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18=-18+-4x
We move all terms to the left:
18-(-18+-4x)=0
We add all the numbers together, and all the variables
-(-4x)+18=0
We get rid of parentheses
4x+18=0
We move all terms containing x to the left, all other terms to the right
4x=-18
x=-18/4
x=-4+1/2
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