4 х+4 х=424; 15 у-8 у=714; 9z+z=500; 10 к-к=702; 4j=5j+j=1200; 6t+3t-t=6400.

4x+4x = 424 15y-8y = 714 9z+z = 500 10k-k = 702

8x = 424 7y = 714 10z = 500 9k = 702

x = 424:8 y = 714:7 z = 500:10 k = 702:9

x = 53 y = 102 z = 50 k = 78

4j+5j+j = 1200 6t+3t-t=6400

10j = 1200 8t = 6400

j = 1200:10 t = 6400:8

j = 120 t = 800

4 х+4 х=424;

8 х=424

х=424/8

х=53

15 у-8 у=714;

7 у=714

у=714/7

у=102

9z+z=500;

10z=500

z=500/10

z=50

10 к-к=702;

9k=702

k=702/9

k=78

4j+5j+j=1200;

10j=1200

j=1200/10

j=120

6t+3t-t=6400

8t=6400

t=6400/8

t=800