решите уравнение: 8 4/9-m=3 7/9; 2-x=1,376; (234+x)-456=178

8 4/9-m=3 7/9;-m=3 7/9 - 8 4/9;-m=-4 6/9m=4 6/9;m=4 2/3;.......................................................2-x=1,376; -x=1,375/2х=-1375/2х=-0,688..........................................................(234+x)-456=178234+х=634х=400