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d in (-oo:+oo)
5*(4*d+2) = 70 // - 70
5*(4*d+2)-70 = 0
5*(4*d+2)-70 = 0
20*d-60 = 0
20*d-60 = 0
20*d-60 = 0 // + 60
20*d = 60 // : 20
d = 60/20
d = 3
d = 3
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