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-1x=2x+18
We move all terms to the left:
-1x-(2x+18)=0
We get rid of parentheses
-1x-2x-18=0
We add all the numbers together, and all the variables
-3x-18=0
We move all terms containing x to the left, all other terms to the right
-3x=18
x=18/-3
x=-6
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