Помогите быстрее это срочно

Решите задачу:

$1) (11/3 + 7/4) = 44/12 + 21/12 = 65/12;77/12 - 9/4 = (77 - 27) /12 = 50 /12;65/12 *12/70 = 13/14;13/14 * 8/10 = 26/35$

$2) (11/4 + 18/7 + 17/28) * (19/8 - 25/14 ) = ( (77 + 72 + 17) /28) * (57/32 - 75/32) = - 166/28 * 18/32 = - 83 / 14 * 9/16$

$85 1 ) 17/24 x= 34/45 ; x = 48/45 = 16/15$

$2 ) 15/4 x = 35/12 + 5/3; 15/4 x = 55/12; x = 11/9$

$3) 62/15 - 9/5 = 28/9 x; 35/15 = 28/9x; 7/3 = 28/9x; x=21/28 = 3/4$

$4) 5/16 x = 49/8 - 11/4 ; 5/16x = 27/8; x = 54/5$