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9x+13=13x+19
We move all terms to the left:
9x+13-(13x+19)=0
We get rid of parentheses
9x-13x-19+13=0
We add all the numbers together, and all the variables
-4x-6=0
We move all terms containing x to the left, all other terms to the right
-4x=6
x=6/-4
x=-1+1/2
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