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Answer:24/63
Step-by-step explanation:first change denominator to equalls so find 7,9 lcm is 63 now
7×9 is 63 so -2×9 is -18 -18/63
9×7 is 63 so 6×7 is 42 so 42/63
42-(-18) so plus minus is minus so minus both numbers and give sign of greater number so 24
24/63
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0.380...
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