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89=15x+29
We move all terms to the left:
89-(15x+29)=0
We get rid of parentheses
-15x-29+89=0
We add all the numbers together, and all the variables
-15x+60=0
We move all terms containing x to the left, all other terms to the right
-15x=-60
x=-60/-15
x=+4
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