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-3x+78=-13x+168
We move all terms to the left:
-3x+78-(-13x+168)=0
We get rid of parentheses
-3x+13x-168+78=0
We add all the numbers together, and all the variables
10x-90=0
We move all terms containing x to the left, all other terms to the right
10x=90
x=90/10
x=9
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