1007 решите пожалуйста, кому не трудно

1/3х + 1/х = 4/15 1/3х + 3/3х = 4/15 4/3х = 4/15 3х = 4 : 4/15 3х = 4 * 15/4 3х = 15 х = 15 : 3 х = 5 1/х - 1/7х = 2/7 7/7х - 1/7х = 2/7 6/7х = 2/7 7х = 6 : 2/7 7х = 6 * 7/2 7х = 3 * 7 7х = 21 х = 21 : 7 х = 3 1/4х + 1/х = 5/16 1/4х + 4/4х = 5/16 5/4х = 5/16 4х = 5 : 5/16 4х = 5 * 16/5 4х = 16 х = 16 : 4 х = 4 1/х - 1/9х = 2/9 9/9х - 1/9х = 2/9 8/9х = 2/9 9х = 8 : 2/9 9х = 8 * 9/2 9х = 4 * 9 9х = 36 х = 36 : 9 х = 4 1/8х + 1/х = 3/8 1/8х + 8/8х = 3/8 9/8х = 3/8 8х = 9 : 3/8 8х = 9 * 8/3 8х = 3 * 8 8х = 24 х = 24 : 8 х = 3 1/х - 1/5х = 2/15 5/5х - 1/5х = 2/15 4/5х = 2/15 5х = 4 : 2/15 5х = 4 * 15/2 5х = 2 * 15 5х = 30 х = 30 : 5 х = 6