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20x-13=15x-89
We move all terms to the left:
20x-13-(15x-89)=0
We get rid of parentheses
20x-15x+89-13=0
We add all the numbers together, and all the variables
5x+76=0
We move all terms containing x to the left, all other terms to the right
5x=-76
x=-76/5
x=-15+1/5
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