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d in (-oo:+oo)
(1/4)*(d-1) = 3*(4*d+3)+1 // - 3*(4*d+3)+1
(1/4)*(d-1)-(3*(4*d+3))-1 = 0
(1/4)*(d-1)-3*(4*d+3)-1 = 0
1/4*(d-1)-3*(4*d+3)-1 = 0
1/4*(d-1)-3*(4*d+3)-1 = 0
-47/4*d-37/4-1 = 0
-47/4*d-41/4 = 0
-47/4*d-41/4 = 0
-47/4*d-41/4 = 0 // + 41/4
-47/4*d = 41/4 // : -47/4
d = 41/4/(-47/4)
d = -41/47
d = -41/47
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