if a=4 b=5c=2 then find the value of 2a+3b-4c/8a +9b-10c
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a = 4, b = 5 and c = 2
2a + 3b - 4c / 8a + 9b - 10c
2*4 + 3*5 - 4*2 / 8*4 + 9*5 - 10*2 = 8 + 15 - 8 / 32 + 45 - 20
= 15 / 77 - 20
= 15 / 57
= 5 / 19
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