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7x+15=3x+30
We move all terms to the left:
7x+15-(3x+30)=0
We get rid of parentheses
7x-3x-30+15=0
We add all the numbers together, and all the variables
4x-15=0
We move all terms containing x to the left, all other terms to the right
4x=15
x=15/4
x=3+3/4
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