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13x+5=8x+20
We move all terms to the left:
13x+5-(8x+20)=0
We get rid of parentheses
13x-8x-20+5=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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