If a + 3b + 5c = 30, and 6b + 10c = 20, what is the value of 4a?

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If <em>a</em> + 3<em>b</em> + 5<em>c</em> = 30, and 6<em>b</em> + 10<em>c</em> = 20, what is the value of 4<em>a</em>?