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13x+15=4x-25
We move all terms to the left:
13x+15-(4x-25)=0
We get rid of parentheses
13x-4x+25+15=0
We add all the numbers together, and all the variables
9x+40=0
We move all terms containing x to the left, all other terms to the right
9x=-40
x=-40/9
x=-4+4/9
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