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y in (-oo:+oo)
12 = (8/4)*y-((3/8)*y)+3/4+1 // - (8/4)*y-((3/8)*y)+3/4+1
(3/8)*y-((8/4)*y)-(3/4)-1+12 = 0
(3/8)*y-2*y-3/4-1+12 = 0
41/4-13/8*y = 0 // - 41/4
-13/8*y = -41/4 // : -13/8
y = -41/4/(-13/8)
y = 82/13
y = 82/13
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