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y in (-oo:+oo)
(2/3)*y-y+4/5 = (1/15)*(y+5) // - (1/15)*(y+5)
(2/3)*y-((1/15)*(y+5))-y+4/5 = 0
(-1/15)*(y+5)+(2/3)*y-y+4/5 = 0
(2*y)/3-1/15*(y+5)-y+4/5 = 0
(-1/15*3*5*(y+5))/(3*5)+(2*5*y)/(3*5)+(3*5*(-y))/(3*5)+(3*4)/(3*5) = 0
2*5*y-1/15*3*5*(y+5)+3*5*(-y)+3*4 = 0
9*y-15*y-5+12 = 0
12-6*y-5 = 0
7-6*y = 0
(7-6*y)/(3*5) = 0
(7-6*y)/(3*5) = 0 // * 3*5
7-6*y = 0
7-6*y = 0 // - 7
-6*y = -7 // : -6
y = -7/(-6)
y = 7/6
y = 7/6
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