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-25=3x+2x
We move all terms to the left:
-25-(3x+2x)=0
We add all the numbers together, and all the variables
-(+5x)-25=0
We get rid of parentheses
-5x-25=0
We move all terms containing x to the left, all other terms to the right
-5x=25
x=25/-5
x=-5
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