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y in (-oo:+oo)
(1/6)*(12*y-30) = (1/5)*(25*y-45) // - (1/5)*(25*y-45)
(1/6)*(12*y-30)-((1/5)*(25*y-45)) = 0
(1/6)*(12*y-30)+(-1/5)*(25*y-45) = 0
1/6*(12*y-30)-1/5*(25*y-45) = 0
1/6*(12*y-30)-1/5*(25*y-45) = 0
4-3*y = 0
4-3*y = 0
4-3*y = 0 // - 4
-3*y = -4 // : -3
y = -4/(-3)
y = 4/3
y = 4/3
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