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355=100x+15
We move all terms to the left:
355-(100x+15)=0
We get rid of parentheses
-100x-15+355=0
We add all the numbers together, and all the variables
-100x+340=0
We move all terms containing x to the left, all other terms to the right
-100x=-340
x=-340/-100
x=3+2/5
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