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100x+15=65x+20
We move all terms to the left:
100x+15-(65x+20)=0
We get rid of parentheses
100x-65x-20+15=0
We add all the numbers together, and all the variables
35x-5=0
We move all terms containing x to the left, all other terms to the right
35x=5
x=5/35
x=1/7
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