/-знак для дроби
2\3*x=4\9*(75-x)
срооочно

2/3*х=4/9*(75-х)2/3х=100/3-4/9х2/3х+4/9х=100/36/9х+4/9х=100/310/9х=100/3х=100/3:10/9                  100/3:10/9=100/3*9/10=30x=30