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d in (-oo:+oo)
5*(2*d-7) = -75 // + 75
5*(2*d-7)+75 = 0
5*(2*d-7)+75 = 0
10*d+40 = 0
10*d+40 = 0
10*d+40 = 0 // - 40
10*d = -40 // : 10
d = -40/10
d = -4
d = -4
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