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-12x-70=-6x+20
We move all terms to the left:
-12x-70-(-6x+20)=0
We get rid of parentheses
-12x+6x-20-70=0
We add all the numbers together, and all the variables
-6x-90=0
We move all terms containing x to the left, all other terms to the right
-6x=90
x=90/-6
x=-15
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