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y in (-oo:+oo)
(-5/2)*(y-8)-((1/4)*y) = 0
(-5/2)*(y-8)+(-1/4)*y = 0
-5/2*(y-8)-y/4 = 0
(-5/2*4*(y-8))/4-y/4 = 0
-5/2*4*(y-8)-y = 0
80-11*y = 0
(80-11*y)/4 = 0
(80-11*y)/4 = 0 // * 4
80-11*y = 0
80-11*y = 0 // - 80
-11*y = -80 // : -11
y = -80/(-11)
y = 80/11
y = 80/11
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