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y=25-4y
We move all terms to the left:
y-(25-4y)=0
We add all the numbers together, and all the variables
y-(-4y+25)=0
We get rid of parentheses
y+4y-25=0
We add all the numbers together, and all the variables
5y-25=0
We move all terms containing y to the left, all other terms to the right
5y=25
y=25/5
y=5
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