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13x-25=3x-4
We move all terms to the left:
13x-25-(3x-4)=0
We get rid of parentheses
13x-3x+4-25=0
We add all the numbers together, and all the variables
10x-21=0
We move all terms containing x to the left, all other terms to the right
10x=21
x=21/10
x=2+1/10
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