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(2.5+-1y)+y=15
We move all terms to the left:
(2.5+-1y)+y-(15)=0
We add all the numbers together, and all the variables
(-1y)+y-15=0
We add all the numbers together, and all the variables
y+(-1y)-15=0
We get rid of parentheses
y-1y-15=0
We add all the numbers together, and all the variables
-15!=0
There is no solution for this equation
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