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y in (-oo:+oo)
12/5 = -((1/5)*(10*y-3))-9*y // + -((1/5)*(10*y-3))-9*y
(1/5)*(10*y-3)-(-9*y)+12/5 = 0
(1/5)*(10*y-3)+9*y+12/5 = 0
1/5*(10*y-3)+9*y+12/5 = 0
(1/5*5*(10*y-3))/5+(5*9*y)/5+12/5 = 0
1/5*5*(10*y-3)+5*9*y+12 = 0
55*y-3+12 = 0
55*y+9 = 0
(55*y+9)/5 = 0
(55*y+9)/5 = 0 // * 5
55*y+9 = 0
55*y+9 = 0 // - 9
55*y = -9 // : 55
y = -9/55
y = -9/55
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