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y+3y=20+12
We move all terms to the left:
y+3y-(20+12)=0
We add all the numbers together, and all the variables
y+3y-32=0
We add all the numbers together, and all the variables
4y-32=0
We move all terms containing y to the left, all other terms to the right
4y=32
y=32/4
y=8
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