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-18-7x=-12-4x
We move all terms to the left:
-18-7x-(-12-4x)=0
We add all the numbers together, and all the variables
-7x-(-4x-12)-18=0
We get rid of parentheses
-7x+4x+12-18=0
We add all the numbers together, and all the variables
-3x-6=0
We move all terms containing x to the left, all other terms to the right
-3x=6
x=6/-3
x=-2
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