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-12x-78=-3x+120
We move all terms to the left:
-12x-78-(-3x+120)=0
We get rid of parentheses
-12x+3x-120-78=0
We add all the numbers together, and all the variables
-9x-198=0
We move all terms containing x to the left, all other terms to the right
-9x=198
x=198/-9
x=-22
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