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13=9x+5-7-4x
We move all terms to the left:
13-(9x+5-7-4x)=0
We add all the numbers together, and all the variables
-(5x-2)+13=0
We get rid of parentheses
-5x+2+13=0
We add all the numbers together, and all the variables
-5x+15=0
We move all terms containing x to the left, all other terms to the right
-5x=-15
x=-15/-5
x=+3
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