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y in (-oo:+oo)
(-3/4)*y-y-(4/5) = (1/20)*(y+9) // - (1/20)*(y+9)
(-3/4)*y-((1/20)*(y+9))-y-(4/5) = 0
(-1/20)*(y+9)+(-3/4)*y-y-4/5 = 0
(-3*y)/4-1/20*(y+9)-y-4/5 = 0
(-1/20*4*5*(y+9))/(4*5)+(-3*5*y)/(4*5)+(4*5*(-y))/(4*5)+(-4*4)/(4*5) = 0
4*5*(-y)-1/20*4*5*(y+9)-3*5*y-4*4 = 0
-16*y-20*y-16-9 = 0
-36*y-16-9 = 0
-36*y-25 = 0
(-36*y-25)/(4*5) = 0
(-36*y-25)/(4*5) = 0 // * 4*5
-36*y-25 = 0
-36*y-25 = 0 // + 25
-36*y = 25 // : -36
y = 25/(-36)
y = -25/36
y = -25/36
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