How much is 3 out of 7 in 15 minus 4 out of 7 in 2?

3 out of 7 in 15 = 15 + 3 / 7
4 out of 7 of 2 = (2 + 4 / 7)
Three out of seven in 15 minus four out of seven in 2 = 15 + 3 / 7 - (- (2 + 4 / 7)) = 15 + 3 / 7 + 2 + 4 / 7 = 17 + 1 = 18

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