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x+15=30x+3
We move all terms to the left:
x+15-(30x+3)=0
We get rid of parentheses
x-30x-3+15=0
We add all the numbers together, and all the variables
-29x+12=0
We move all terms containing x to the left, all other terms to the right
-29x=-12
x=-12/-29
x=12/29
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