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13x=4x-45
We move all terms to the left:
13x-(4x-45)=0
We get rid of parentheses
13x-4x+45=0
We add all the numbers together, and all the variables
9x+45=0
We move all terms containing x to the left, all other terms to the right
9x=-45
x=-45/9
x=-5
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