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13x=3x+100
We move all terms to the left:
13x-(3x+100)=0
We get rid of parentheses
13x-3x-100=0
We add all the numbers together, and all the variables
10x-100=0
We move all terms containing x to the left, all other terms to the right
10x=100
x=100/10
x=10
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