We know this equation : $$ x_1 + x_2 + \dots + x_n = c$$ and also the number of solutions is obvious . But how we can understand number of solutions in this equation : $$ a_1x_1 + a_2x_2 + \dots + a_nx_n = k$$
Please Help!
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2See the answers here. – Dietrich Burde Dec 08 '16 at 16:03
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@Dietrich Burde Thank you , But it seems in this page hasn't any certain and complete answer for this question – S.H.W Dec 08 '16 at 19:14