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4x+15=9x-50
We move all terms to the left:
4x+15-(9x-50)=0
We get rid of parentheses
4x-9x+50+15=0
We add all the numbers together, and all the variables
-5x+65=0
We move all terms containing x to the left, all other terms to the right
-5x=-65
x=-65/-5
x=+13
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