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0.25x+40=0.45x+25
We move all terms to the left:
0.25x+40-(0.45x+25)=0
We get rid of parentheses
0.25x-0.45x-25+40=0
We add all the numbers together, and all the variables
-0.2x+15=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-15
x=-15/-0.2
x=+75
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