7х-9/12=35/84 2х+7/17 =60/68

1) 7x - 9/12 = 35/84;

7x = 35/84 + 9/12;

7x = 35/84 + (9 * 7)/(12 * 7);

7x = 35/84 + 63/84;

7x = (35 + 63)/84;

7x = 98/84;

7x = 1 14/84;

7x = 1 14/(6 * 14);

7x = 1 1/6;

x = 1 1/6 : 7;

x = (1 * 6 + 1)/6 : 7;

x = (6 + 1)/6 : 7;

x = 7/6 : 7;

x = 7/6 * 1/7;

x = (7 * 1)/(6 * 7);

x = 1/6.

Ответ: х = 1/6.

2) 2x + 7/17 = 60/68;

2x = 60/68 - 7/17;

2x = (4 * 15)/(4 * 17) - 7/17;

2x = 15/17 - 7/17;

2x = (15 - 7)/17;

2x = 8/17;

x = 8/17 : 2;

x = 8/17 * 1/2;

x = (8 * 1)/(17 * 2);

x = (4 * 2)/(17 * 2);

x = 4/17.

Ответ: х = 4/17.