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9x-90=13x-50
We move all terms to the left:
9x-90-(13x-50)=0
We get rid of parentheses
9x-13x+50-90=0
We add all the numbers together, and all the variables
-4x-40=0
We move all terms containing x to the left, all other terms to the right
-4x=40
x=40/-4
x=-10
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