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13x-9=9x-37
We move all terms to the left:
13x-9-(9x-37)=0
We get rid of parentheses
13x-9x+37-9=0
We add all the numbers together, and all the variables
4x+28=0
We move all terms containing x to the left, all other terms to the right
4x=-28
x=-28/4
x=-7
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