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y in (-oo:+oo)
(y-8)/12 = y/5 // - y/5
(y-8)/12-(y/5) = 0
(y-8)/12-y/5 = 0
(5*(y-8))/(5*12)+(12*(-y))/(5*12) = 0
5*(y-8)+12*(-y) = 0
-7*y-40 = 0
(-7*y-40)/(5*12) = 0
(-7*y-40)/(5*12) = 0 // * 5*12
-7*y-40 = 0
-7*y-40 = 0 // + 40
-7*y = 40 // : -7
y = 40/(-7)
y = -40/7
y = -40/7
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