4/15 - 7/15 + 2/3 = I just watched other answers and I do not understand as 7/15 turn out.

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For performance of calculations we will reduce all fractions to a common denominator (15): 4/15 - 7/15 + 2/3 = 4/15 - 7/15 + 2*5/5*3 = 4/15 - 7/15 + 10/15 we Will write down expression under a common denominator and we will carry out calculation: (4 - 7 + 10) / 15 = 7/15
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Answer add