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y in (-oo:+oo)
(-3/8)*(-(2*y)-6) = (1/2)*(2*y-3) // - (1/2)*(2*y-3)
(-3/8)*(-(2*y)-6)-((1/2)*(2*y-3)) = 0
(-3/8)*(-2*y-6)+(-1/2)*(2*y-3) = 0
-3/8*(-2*y-6)-1/2*(2*y-3) = 0
-3/8*(-2*y-6)-1/2*(2*y-3) = 0
15/4-1/4*y = 0
15/4-1/4*y = 0
15/4-1/4*y = 0 // - 15/4
-1/4*y = -15/4 // : -1/4
y = -15/4/(-1/4)
y = 15
y = 15
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