Решите уравнение:
а) 1,53x + 0,47x = 15;
б) 3,28x + 4,72x = 17;
в) 84,6x − 44,6x = 35;
г) 39,49x + 10,51x = 18.
1,53x + 0,47x = 15
2x = 15
x = 15 : 2
x = 7,5
3,28x + 4,72x = 17
8x = 17
x = 17 : 8
x = 2,125
84,6x − 44,6x = 35
40x = 35
x = 35 : 40
x = 0,875
39,49x + 10,51x = 18
50x = 18
x = 18 : 50
x = 0,36