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Elementary Number Theory.. If a divides..

If a divides (2c+3d) and if (-a) divides (c+d) then show that 3a divides 3c.

The only progres I can say i've made is that it is basically asking to show that a divides c, because the 3 is only a constant.

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    This site is for MathematicA not MathematicS!2012-09-18
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    If (-a) divides (c+d) then also a divides (c+d). If a|c+d then a|3*(c+d). Take it from there (but on a site appropriate to this question).2012-09-18
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    A lost pink panda2012-09-18

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