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d in (-oo:+oo)
148 = 7*d+6*d+5 // - 7*d+6*d+5
148-(7*d)-(6*d)-5 = 0
148-7*d-6*d-5 = 0
143-13*d = 0 // - 143
-13*d = -143 // : -13
d = -143/(-13)
d = 11
d = 11
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