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-12x+4=-9x+8
We move all terms to the left:
-12x+4-(-9x+8)=0
We get rid of parentheses
-12x+9x-8+4=0
We add all the numbers together, and all the variables
-3x-4=0
We move all terms containing x to the left, all other terms to the right
-3x=4
x=4/-3
x=-1+1/3
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