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205/350 is the answer because if you do -2/5+7/10 first then you get 15/50. You get this by 7*5 + -2*10 for the numerator. The for the domanator just multiply the domanators. Then do the same for the other fraction.
The answer is 41/70! If you get the LCD, which is 70, you multiply all denominators by a number which gives you 70. Then, you would do the same for the top number