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y in (-oo:+oo)
(3/5)*y-y+2/3 = (1/15)*(y-6) // - (1/15)*(y-6)
(3/5)*y-((1/15)*(y-6))-y+2/3 = 0
(-1/15)*(y-6)+(3/5)*y-y+2/3 = 0
(3*y)/5-1/15*(y-6)-y+2/3 = 0
(-1/15*3*5*(y-6))/(3*5)+(3*3*y)/(3*5)+(3*5*(-y))/(3*5)+(2*5)/(3*5) = 0
3*3*y-1/15*3*5*(y-6)+3*5*(-y)+2*5 = 0
8*y-15*y+6+10 = 0
6-7*y+10 = 0
16-7*y = 0
(16-7*y)/(3*5) = 0
(16-7*y)/(3*5) = 0 // * 3*5
16-7*y = 0
16-7*y = 0 // - 16
-7*y = -16 // : -7
y = -16/(-7)
y = 16/7
y = 16/7
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