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d in (-oo:+oo)
5*(7*d-8) = 310 // - 310
5*(7*d-8)-310 = 0
5*(7*d-8)-310 = 0
35*d-350 = 0
35*d-350 = 0
35*d-350 = 0 // + 350
35*d = 350 // : 35
d = 350/35
d = 10
d = 10
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