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13x-25=9-13
We move all terms to the left:
13x-25-(9-13)=0
We add all the numbers together, and all the variables
13x-25-(-4)=0
We add all the numbers together, and all the variables
13x-21=0
We move all terms containing x to the left, all other terms to the right
13x=21
x=21/13
x=1+8/13
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