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y in (-oo:+oo)
(1/10)*(y-3) = (2/5)*(y+9)-((1/5)*y) // - (2/5)*(y+9)-((1/5)*y)
(1/10)*(y-3)-((2/5)*(y+9))+(1/5)*y = 0
(1/10)*(y-3)+(-2/5)*(y+9)+(1/5)*y = 0
1/10*(y-3)-2/5*(y+9)+y/5 = 0
(1/10*5*(y-3))/5+(-2/5*5*(y+9))/5+y/5 = 0
1/10*5*(y-3)-2/5*5*(y+9)+y = 0
y-3/2*y-39/2 = 0
-1/2*y-39/2 = 0
(-1/2*y-39/2)/5 = 0
(-1/2*y-39/2)/5 = 0 // * 5
-1/2*y-39/2 = 0
-1/2*y-39/2 = 0 // + 39/2
-1/2*y = 39/2 // : -1/2
y = 39/2/(-1/2)
y = -39
y = -39
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