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y in (-oo:+oo)
(-7/2)*(y-8)-(1/4) = 0
(-7/2)*(y-8)-1/4 = 0
-7/2*(y-8)-1/4 = 0
(-7/2*4*(y-8))/4-1/4 = 0
-7/2*4*(y-8)-1 = 0
111-14*y = 0
(111-14*y)/4 = 0
(111-14*y)/4 = 0 // * 4
111-14*y = 0
111-14*y = 0 // - 111
-14*y = -111 // : -14
y = -111/(-14)
y = 111/14
y = 111/14
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