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y in (-oo:+oo)
(-2/5)*y-y+2/3 = (1/15)*(y+9) // - (1/15)*(y+9)
(-2/5)*y-((1/15)*(y+9))-y+2/3 = 0
(-1/15)*(y+9)+(-2/5)*y-y+2/3 = 0
(-2*y)/5-1/15*(y+9)-y+2/3 = 0
(-1/15*3*5*(y+9))/(3*5)+(-2*3*y)/(3*5)+(3*5*(-y))/(3*5)+(2*5)/(3*5) = 0
3*5*(-y)-1/15*3*5*(y+9)-2*3*y+2*5 = 0
10-7*y-15*y-9 = 0
10-22*y-9 = 0
1-22*y = 0
(1-22*y)/(3*5) = 0
(1-22*y)/(3*5) = 0 // * 3*5
1-22*y = 0
1-22*y = 0 // - 1
-22*y = -1 // : -22
y = -1/(-22)
y = 1/22
y = 1/22
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