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d in (-oo:+oo)
7*(4*d+1) = 147 // - 147
7*(4*d+1)-147 = 0
7*(4*d+1)-147 = 0
28*d-140 = 0
28*d-140 = 0
28*d-140 = 0 // + 140
28*d = 140 // : 28
d = 140/28
d = 5
d = 5
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