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13x=9x+76
We move all terms to the left:
13x-(9x+76)=0
We get rid of parentheses
13x-9x-76=0
We add all the numbers together, and all the variables
4x-76=0
We move all terms containing x to the left, all other terms to the right
4x=76
x=76/4
x=19
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