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y in (-oo:+oo)
(-6/5)*(y-10)-((1/15)*y) = 0
(-6/5)*(y-10)+(-1/15)*y = 0
-6/5*(y-10)-y/15 = 0
(-6/5*15*(y-10))/15-y/15 = 0
-6/5*15*(y-10)-y = 0
180-19*y = 0
(180-19*y)/15 = 0
(180-19*y)/15 = 0 // * 15
180-19*y = 0
180-19*y = 0 // - 180
-19*y = -180 // : -19
y = -180/(-19)
y = 180/19
y = 180/19
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