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y in (-oo:+oo)
y/3-((y-8)/5) = -12/5 // + -12/5
y/3-((y-8)/5)-(-12/5) = 0
y/3-((y-8)/5)+12/5 = 0
(-1*(y-8))/5+y/3+12/5 = 0
(-1*3*(y-8))/(3*5)+(5*y)/(3*5)+(3*12)/(3*5) = 0
5*y-1*3*(y-8)+3*12 = 0
2*y+24+36 = 0
2*y+60 = 0
(2*y+60)/(3*5) = 0
(2*y+60)/(3*5) = 0 // * 3*5
2*y+60 = 0
2*y+60 = 0 // - 60
2*y = -60 // : 2
y = -60/2
y = -30
y = -30
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