Решите уравнение: 1) 5 11/14 х - 8/15 = 5/21; 5)

1) 5 11/14 х - 8/15 = 5/21; 5 11/14 х=5/21 + 8/15; 5 11/14 х=(25+56)/105;
5 11/14 х=81/105=27/35; х=27/35 * 14/81; х=1/5 * 2/3; х=2/15
2) 7 3/10 + 25/28 х = 8 13/35; 25/28 х = 8 13/35 - 7 3/10; 25/28 х = 48/35 - 3/10;
25/28 х=(96-21)/70; 25/28 х=75/70=15/14; х=15/14 * 28/25; х=3/1 * 2/5; х=6/5=1 1/5
3) 3 1/3 - 1 1/20 х = 1 14/15; 1 1/20 х = 3 1/3 - 1 14/15; 1 1/20 х = 2 1/3 - 14/15;
21/20 х = 7/3 - 14/15; 21/20 х = (35-14)/15; 21/20 х=21/15; 21/20 х=7/5;
х=7/5 * 20/21; х=1/1 * 4/3; х=4/3=1 1/3
4) 3/8 х + 7/12 х - 5/6 х = 9/32; (3/8+7/12- 5/6) х = 9/32; (9+14-20)/24 х = 9/32;
3/24 х = 9/32; х=9/32 * 24/3; х=9/4 * 1/1; х=9/4=2 1/4
5) 2 1/3 : х - 1 1/6 = 1 5/9; 2 1/3 : х = 1 5/9 + 1 1/6; 2 1/3 : х = 2 + (10+3)/18;
7/3 : х = 2 13/18; х = 7/3 * 18/49; х=1/1 * 6/7; х=6/7
6) 2 1/3 : (х - 1 1/6) = 1 5/9; (х - 1 1/6) = 2 1/3 : 1 5/9; х - 1 1/6= 7/3 * 9/14;
х - 1 1/6=1/1 * 3/2; х - 1 1/6=3/2; х=3/2 + 1 1/6; х=9/6 + 7/6; х=16/6=8/3=2 2/3
7) 27 : (31 3/7 - 2 11/14 х) = 1 1/8; 31 3/7 - 2 11/14 х =27 * 8/9;
31 3/7 - 2 11/14 х =24; 2 11/14 х =31 3/7 - 24; 2 11/14 х =7 3/7; 39/14 х =52/7;
х=52/7 * 14/39; х=4/1 * 2/3; х=8/3=2 2/3
8) 48 : (3 4/5 х - 25) = 1 1/2; 3 4/5 х - 25=48 : 1 1/2; 3 4/5 х - 25=48 * 2/3;
3 4/5 х - 25=32; 3 4/5 х=32+25; 3 4/5 х=57; х=57/1 * 5/19; х=3/1 * 5/1; х=15