2(х+1,2)=2,7-х б)7\9х-5\18х=-3

2(x+1,2)=2,7-x2x+2,4=2,7-x2x+x=2,7-2,43x=0,1x=0,1(7/9x)2- 5/18x=-314/18x-5/18x=-39/18x=-30,5x=-3x=-6