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y in (-oo:+oo)
(-4/3)*(y-15)-((1/12)*y) = 0
(-4/3)*(y-15)+(-1/12)*y = 0
-4/3*(y-15)-y/12 = 0
(-4/3*12*(y-15))/12-y/12 = 0
-4/3*12*(y-15)-y = 0
240-17*y = 0
(240-17*y)/12 = 0
(240-17*y)/12 = 0 // * 12
240-17*y = 0
240-17*y = 0 // - 240
-17*y = -240 // : -17
y = -240/(-17)
y = 240/17
y = 240/17
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