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9x-15=13x+7
We move all terms to the left:
9x-15-(13x+7)=0
We get rid of parentheses
9x-13x-7-15=0
We add all the numbers together, and all the variables
-4x-22=0
We move all terms containing x to the left, all other terms to the right
-4x=22
x=22/-4
x=-5+1/2
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