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8=4y+20-8y
We move all terms to the left:
8-(4y+20-8y)=0
We add all the numbers together, and all the variables
-(-4y+20)+8=0
We get rid of parentheses
4y-20+8=0
We add all the numbers together, and all the variables
4y-12=0
We move all terms containing y to the left, all other terms to the right
4y=12
y=12/4
y=3
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