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70=3x-7+8x
We move all terms to the left:
70-(3x-7+8x)=0
We add all the numbers together, and all the variables
-(11x-7)+70=0
We get rid of parentheses
-11x+7+70=0
We add all the numbers together, and all the variables
-11x+77=0
We move all terms containing x to the left, all other terms to the right
-11x=-77
x=-77/-11
x=+7
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