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40-12x=15x-25
We move all terms to the left:
40-12x-(15x-25)=0
We get rid of parentheses
-12x-15x+25+40=0
We add all the numbers together, and all the variables
-27x+65=0
We move all terms containing x to the left, all other terms to the right
-27x=-65
x=-65/-27
x=2+11/27
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