Question

Решите уравнение: (3/5+3/4x)*20=42

Answer 1

3/5+3/4х=42/20
3/4х=42/20-3/5
3/4х=42/20-12/20
3/4х=30/20
х=30/20 : 3/4
х =30/20 * 4/3
х =10/5 * 1/1
х = 10 : 5
х = 2

Answer 2

раскроем скобки 3/5*20=12
3/4х*20=15х
12+15х=42
15х=42-12
15х=30
х=2