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