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13x-20=3x+30
We move all terms to the left:
13x-20-(3x+30)=0
We get rid of parentheses
13x-3x-30-20=0
We add all the numbers together, and all the variables
10x-50=0
We move all terms containing x to the left, all other terms to the right
10x=50
x=50/10
x=5
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