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