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13=2.5+y
We move all terms to the left:
13-(2.5+y)=0
We add all the numbers together, and all the variables
-(y+2.5)+13=0
We get rid of parentheses
-y-2.5+13=0
We add all the numbers together, and all the variables
-1y+10.5=0
We move all terms containing y to the left, all other terms to the right
-y=-10.5
y=-10.5/-1
y=10+0.5/1
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