решите уравнения. (х-5ц3/21)+2ц6/7=9ц1/14; 21ц1/4-(х+2ц5/12)=6ц7/8

Спасибо большое

х-5 3/21+2 6/7=9 1/14х=9 3/42+5 6/42-2 36/42х=14 9/42-2 36/42х=13 51/42-2 36/42х=11 15/42х=11 5/1421 1/4-х-2 5/12=6 7/821 6/24-2 10/24-6 21/24=хх=21 6/24-8 31/24х=20 30/24-9 7/24х=11 23/24