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x/13-9x/13=40/13
We move all terms to the left:
x/13-9x/13-(40/13)=0
We add all the numbers together, and all the variables
x/13-9x/13-(+40/13)=0
We get rid of parentheses
x/13-9x/13-40/13=0
We multiply all the terms by the denominator
x-9x-40=0
We add all the numbers together, and all the variables
-8x-40=0
We move all terms containing x to the left, all other terms to the right
-8x=40
x=40/-8
x=-5
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