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y in (-oo:+oo)
(1/2)*(y-8) = 3.5*y+8 // - 3.5*y+8
(1/2)*(y-8)-(3.5*y)-8 = 0
(1/2)*(y-8)-3.5*y-8 = 0
1/2*(y-8)-3.5*y-8 = 0
1/2*(y-8)-3.5*y-8 = 0
-3*y-8-4 = 0
-3*y-12 = 0
-3*y-12 = 0
-3*y-12 = 0 // + 12
-3*y = 12 // : -3
y = 12/(-3)
y = -4
y = -4
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