SOLUTION: 21 = 2(4a + 2)

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Question 71638: 21 = 2(4a + 2)
Answer by checkley75(3666) About Me  (Show Source):
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21=2(4a+2)
21=8a+4
8a=21-4
8a=17
a=17/8
proof
21=2(4*17/8)+2)
21=2(68/8+2)
21=2(8.5+2)
21=2(10.5)
21=21