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10x-20=3x+15
We move all terms to the left:
10x-20-(3x+15)=0
We get rid of parentheses
10x-3x-15-20=0
We add all the numbers together, and all the variables
7x-35=0
We move all terms containing x to the left, all other terms to the right
7x=35
x=35/7
x=5
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