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13x+20=4x+290
We move all terms to the left:
13x+20-(4x+290)=0
We get rid of parentheses
13x-4x-290+20=0
We add all the numbers together, and all the variables
9x-270=0
We move all terms containing x to the left, all other terms to the right
9x=270
x=270/9
x=30
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