Ответ: а)6,7-х=2,8х=6.7-2.8х=3.9б)у-2,7=3,4у=3.4+2.7у=6.1в)(х+3,5)-4,8=2,4х+3.5=2.4+4.8х+3.5=7.2х=7.2-3.5х=3.7г)(7,1-х)+3,9=4,5 7.1-х=4.5-3.9 7.1-х=0.6 х=7.1-0.6 х=6.5