7/9
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both are divisible by seven. 42/49 = 6/7
lowest common denominator= 70 therefore; 5/7 + 7/10 = 50/70 + 49/ 70 = 99/70= 1 and 29/70 5/7 - 7/10 = 50/70 - 49/70 = 1/70
49/100 = 49%
49
"negative 49 over 19" is the ratio of -49 to 19. That's rational.