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y in (-oo:+oo)
(-1/2)*(-4*y-8)+6*y = 0
6*y-1/2*(-4*y-8) = 0
6*y-1/2*(-4*y-8) = 0
8*y+4 = 0
8*y+4 = 0
8*y+4 = 0 // - 4
8*y = -4 // : 8
y = -4/8
y = -1/2
y = -1/2
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