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(4/5х - 2/3) * 15 = 7 4/5х - 2/3 = 7 : 15 4/5х - 2/3 = 7/15 4/5х = 7/15 + 2/3 4/5х = 7/15 + 10/15 4/5х = 17/15 х = 17/15 : 4/5 х = 17/15 * 5/4 х = 17/3 * 1/4 х = 17/12 = 1 5/12