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77=x+7x+5x
We move all terms to the left:
77-(x+7x+5x)=0
We add all the numbers together, and all the variables
-(+13x)+77=0
We get rid of parentheses
-13x+77=0
We move all terms containing x to the left, all other terms to the right
-13x=-77
x=-77/-13
x=5+12/13
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