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-70-10=x+3x
We move all terms to the left:
-70-10-(x+3x)=0
We add all the numbers together, and all the variables
-(+4x)-70-10=0
We add all the numbers together, and all the variables
-(+4x)-80=0
We get rid of parentheses
-4x-80=0
We move all terms containing x to the left, all other terms to the right
-4x=80
x=80/-4
x=-20
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