The number of elements (x,y) in s such that 3x + 4y + 5 is divisible by 19
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x is 7
y is 3
therefore 3×7 + 4×3 + 5 = 38 which is exactly divisible by 19
y is 3
therefore 3×7 + 4×3 + 5 = 38 which is exactly divisible by 19
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