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11x-15=x+20
We move all terms to the left:
11x-15-(x+20)=0
We get rid of parentheses
11x-x-20-15=0
We add all the numbers together, and all the variables
10x-35=0
We move all terms containing x to the left, all other terms to the right
10x=35
x=35/10
x=3+1/2
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