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(2-9y)(17-4y)=4/5
We move all terms to the left:
(2-9y)(17-4y)-(4/5)=0
We add all the numbers together, and all the variables
(-9y+2)(-4y+17)-(+4/5)=0
We get rid of parentheses
(-9y+2)(-4y+17)-4/5=0
We multiply parentheses ..
(+36y^2-153y-8y+34)-4/5=0
We multiply all the terms by the denominator
((+36y^2-153y-8y+34))*5-4=0
We move all terms containing y to the left, all other terms to the right
((+36y^2-153y-8y+34))*5=4
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