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70=3x+x
We move all terms to the left:
70-(3x+x)=0
We add all the numbers together, and all the variables
-(+4x)+70=0
We get rid of parentheses
-4x+70=0
We move all terms containing x to the left, all other terms to the right
-4x=-70
x=-70/-4
x=17+1/2
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