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y in (-oo:+oo)
(-6/5)*(y-20)-((1/15)*y) = 0
(-6/5)*(y-20)+(-1/15)*y = 0
-6/5*(y-20)-y/15 = 0
(-6/5*15*(y-20))/15-y/15 = 0
-6/5*15*(y-20)-y = 0
360-19*y = 0
(360-19*y)/15 = 0
(360-19*y)/15 = 0 // * 15
360-19*y = 0
360-19*y = 0 // - 360
-19*y = -360 // : -19
y = -360/(-19)
y = 360/19
y = 360/19
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