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d in (-oo:+oo)
(-4/7)*(d-5) = 3 // - 3
(-4/7)*(d-5)-3 = 0
-4/7*(d-5)-3 = 0
-4/7*(d-5)-3 = 0
-4/7*d-1/7 = 0
-4/7*d-1/7 = 0
-4/7*d-1/7 = 0 // + 1/7
-4/7*d = 1/7 // : -4/7
d = 1/7/(-4/7)
d = -1/4
d = -1/4
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