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11=+-0.5y
We move all terms to the left:
11-(+-0.5y)=0
We add all the numbers together, and all the variables
-(-0.5y)+11=0
We get rid of parentheses
0.5y+11=0
We move all terms containing y to the left, all other terms to the right
0.5y=-11
y=-11/0.5
y=-22
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