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89=x+13(7)x
We move all terms to the left:
89-(x+13(7)x)=0
We add all the numbers together, and all the variables
-(+138x)+89=0
We get rid of parentheses
-138x+89=0
We move all terms containing x to the left, all other terms to the right
-138x=-89
x=-89/-138
x=89/138
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