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13=y+2.1
We move all terms to the left:
13-(y+2.1)=0
We get rid of parentheses
-y-2.1+13=0
We add all the numbers together, and all the variables
-1y+10.9=0
We move all terms containing y to the left, all other terms to the right
-y=-10.9
y=-10.9/-1
y=10+0.9/1
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