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y in (-oo:+oo)
(2/5)*(15-(10*y)) = (3/4)*(12*y-4) // - (3/4)*(12*y-4)
(2/5)*(15-(10*y))-((3/4)*(12*y-4)) = 0
(2/5)*(15-10*y)+(-3/4)*(12*y-4) = 0
2/5*(15-10*y)-3/4*(12*y-4) = 0
2/5*(15-10*y)-3/4*(12*y-4) = 0
9-13*y = 0
9-13*y = 0
9-13*y = 0 // - 9
-13*y = -9 // : -13
y = -9/(-13)
y = 9/13
y = 9/13
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