Найти x. нужно решение. 1) 1/2 x = 1/3 + 2/5 2) 3x+3/4 = 1/7

1)
1/2x = 1/3 + 2/5
1/2x = 5/15 + 6/15 = 11/15
1/2x = 11/15
x = 11/15 * 2 = 22/15

2)
3x + 3/4 = 1/7
3x = 1/7 - 3/4
3x = 4/28 - 21/28 = -17/28
x = -17/28 * 1/3 = -17/84