Решите уравнение:
а) 4x + 4x = 424;
б) 15у − 8y = 714;
в) 9z + z = 500;
г) 10k − k = 702;
д) 4l + 5l + l = 1200;
е) 6t + 3t − t = 6400.
4x + 4x = 424
8x = 424
x = 424 : 8 = 53
15y − 8y = 714
7y = 714
у = 741 : 7 = 102
9z + z = 500
102 = 500
z = 500 : 10 = 50
10k − k = 702
9k = 702
k = 702 : 9 = 78
4l + 5l + l = 1200
10l = 1200
l = 1200 : 10 = 120
6t + 3t − t = 6400
8t = 6400
t = 6400 : 8 = 800