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y in (-oo:+oo)
(-6/5)*(y-25)-((1/15)*y) = 0
(-6/5)*(y-25)+(-1/15)*y = 0
-6/5*(y-25)-y/15 = 0
(-6/5*15*(y-25))/15-y/15 = 0
-6/5*15*(y-25)-y = 0
450-19*y = 0
(450-19*y)/15 = 0
(450-19*y)/15 = 0 // * 15
450-19*y = 0
450-19*y = 0 // - 450
-19*y = -450 // : -19
y = -450/(-19)
y = 450/19
y = 450/19
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