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52=5x+18=90
We move all terms to the left:
52-(5x+18)=0
We get rid of parentheses
-5x-18+52=0
We add all the numbers together, and all the variables
-5x+34=0
We move all terms containing x to the left, all other terms to the right
-5x=-34
x=-34/-5
x=6+4/5
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