Question

решите уравнение (300-х)х5=210

Answer 1

(300-х)*5=210
300-х=210:5
300-х=42
х=300-42
х=258

Answer 2

(300-x)*5=210
(300-x)=210:5
(300-x)=42
x=300-42
x=258          
(300-258)*5=210