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y in (-oo:+oo)
(-6/5)*(y-20)-((1/10)*y) = 0
(-6/5)*(y-20)+(-1/10)*y = 0
-6/5*(y-20)-y/10 = 0
(-6/5*10*(y-20))/10-y/10 = 0
-6/5*10*(y-20)-y = 0
240-13*y = 0
(240-13*y)/10 = 0
(240-13*y)/10 = 0 // * 10
240-13*y = 0
240-13*y = 0 // - 240
-13*y = -240 // : -13
y = -240/(-13)
y = 240/13
y = 240/13
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