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y+3y=15+25
We move all terms to the left:
y+3y-(15+25)=0
We add all the numbers together, and all the variables
y+3y-40=0
We add all the numbers together, and all the variables
4y-40=0
We move all terms containing y to the left, all other terms to the right
4y=40
y=40/4
y=10
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