5/7*(0,21-1,4х)-4/9*(0,36-4,5х) = 10,15-1х - 0,16+2х = 12х-1х = 1-0,15+0,16х = 1,015/7*(0,21-1,4*1,01)-4/9*(0,36-4,5*1,01)= 5/7*(-1,204)- 4/9*(-4,185) = -0,86+1,86 = 1Ответ: 1,01. 5/7*21/100+5/7*(-14/10х)-4/9*36/100-4/9*(-45/10х) = 15/7*21/100+5/7*(-7/5х)-4/9*9/25-4/9*(-9/2х) = 13/20-х-4/25+2х = 12х-х = 1+4/25-3/20х = 29/25-3/20х = 116/100-15/100х = 101/100х = 1 1/100Ответ: 1 1/100.