(15-y+y)(15-y-y)=75

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Solution for (15-y+y)(15-y-y)=75 equation: 



(15-y+y)(15-y-y)=75

We move all terms to the left:

(15-y+y)(15-y-y)-(75)=0

We add all the numbers together, and all the variables

15(-2y+15)-75=0

We multiply parentheses

-30y+225-75=0

We add all the numbers together, and all the variables

-30y+150=0

We move all terms containing y to the left, all other terms to the right

-30y=-150

y=-150/-30

y=+5

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