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y in (-oo:+oo)
(-5/3)*(y-12)-((1/9)*y) = 0
(-5/3)*(y-12)+(-1/9)*y = 0
-5/3*(y-12)-y/9 = 0
(-5/3*9*(y-12))/9-y/9 = 0
-5/3*9*(y-12)-y = 0
180-16*y = 0
(180-16*y)/9 = 0
(180-16*y)/9 = 0 // * 9
180-16*y = 0
180-16*y = 0 // - 180
-16*y = -180 // : -16
y = -180/(-16)
y = 45/4
y = 45/4
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