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6.-0.5y+20-0.5y=13
We move all terms to the left:
6.-0.5y+20-0.5y-(13)=0
We add all the numbers together, and all the variables
-1y+13=0
We move all terms containing y to the left, all other terms to the right
-y=-13
y=-13/-1
y=+13
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