Решите уравнения: 1-x=1\5 x+2\7=1 1-x=4\7

1 - x = 1/5;- х = 1/5 - 1;- х = 1/5 - 5/5;- х = - 4/5;- х * (-1) = - 4/5 * (-1);х = 4/5;1 - 4/5 = 1/5;5/5 - 4/5 = 1/5;1/5 = 1/5.x + 2/7 = 1;х = 1 - 2/7;х = 7/7 - 2/7;х = 5/7;5/7 + 2/7 = 1;7/7 = 1;1 = 1.1 - x = 4/7;- х = 4/7 - 1;- х = 4/7 - 7/7;- х = - 3/7;- х * (-1) = - 3/7 * (-1);х = 3/7;1 - 3/7 = 4/7;7/7 - 3/7 = 4/7;4/7 = 4/7.