Решите уравнение:

1) 2x + 3/7 = 5/7

2x = 5/7 - 3/7

2x = (5 - 3)/7 = 2/7

2x = 2/7

x = 2/7 : 2

x = (2 * 1)/(7 * 2) = 2/14 = 1/7

2) 3/5x + 2(3/4) = 3(7/8)

3/5x = 3(7/8) - 2(3/4) = 31/8 - 22/8 = 9/8

3/5x = 9/8

x = 9/8 : 3/5 = (9 * 5)/(8 * 3) = 45/24 = 15/8

x = 15/8 = 1(7/8)

3) 1(8/9) + 3/8x = 4(1/2)

3/8x = 4(1/2) - 1(8/9) = 81/18 + 34/18 = 47/18

3/8x = 47/18

x = 47/18 : 3/8 = (115 * 8)/(18 * 3) = 188/27

4) 1(2/3) + 2(3/4)x = 6

2(3/4)x = 6 - 1(2/3) = 18/3 - 5/3 = 13/3

x = 13/3 : 2(3/4)

x = 52/33