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7x+15=2x+65
We move all terms to the left:
7x+15-(2x+65)=0
We get rid of parentheses
7x-2x-65+15=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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