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-4x+12=-x-18
We move all terms to the left:
-4x+12-(-x-18)=0
We add all the numbers together, and all the variables
-4x-(-1x-18)+12=0
We get rid of parentheses
-4x+1x+18+12=0
We add all the numbers together, and all the variables
-3x+30=0
We move all terms containing x to the left, all other terms to the right
-3x=-30
x=-30/-3
x=+10
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