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y in (-oo:+oo)
(-2/3)*(y-15)-((1/9)*y) = 0
(-2/3)*(y-15)+(-1/9)*y = 0
-2/3*(y-15)-y/9 = 0
(-2/3*9*(y-15))/9-y/9 = 0
-2/3*9*(y-15)-y = 0
90-7*y = 0
(90-7*y)/9 = 0
(90-7*y)/9 = 0 // * 9
90-7*y = 0
90-7*y = 0 // - 90
-7*y = -90 // : -7
y = -90/(-7)
y = 90/7
y = 90/7
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