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s17 = 17/2 . (2a+ 16b)
= 17 x (a + 8b) = 0
= a + 8b = 0
a + 8b = 0
a + 5b = 21 _
3b = -21
b = -7
a + 5b = 21
a - 35 = 21
a = 21 + 35
a = 56