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y in (-oo:+oo)
(-7/2)*(y-6)-((1/4)*y) = 0
(-7/2)*(y-6)+(-1/4)*y = 0
-7/2*(y-6)-y/4 = 0
(-7/2*4*(y-6))/4-y/4 = 0
-7/2*4*(y-6)-y = 0
84-15*y = 0
(84-15*y)/4 = 0
(84-15*y)/4 = 0 // * 4
84-15*y = 0
84-15*y = 0 // - 84
-15*y = -84 // : -15
y = -84/(-15)
y = 28/5
y = 28/5
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