2.1)9(х-1) = х+15,9х-9 = х+15,9х-х = 15+9,8х = 24,х = 3,2) (11х+14) - (5х-8) = 25,11х+14-5х+8 = 25,6х = 25-14-8,6х = 3,х = 1/2 (или =0,5),3)12- 4(х-3) = 39-9х,12-4х+12 = 39-9х,-4х+9х = 39-12-12,5х = 15,х = 3,4)2(3х+5) - 3(4х-1) = 11,8,6х+10-12х+3 = 11,8,-6х = 11,8-10-3,-6х = -1,2,х = 0,2 (или = 1/5),3.0,3у + 2(0,2у - 0,3) = 0,8- 0,7(у - 2),0,3у + 0,4у - 0,6 = 0,8 - 0,7у + 1,4,0,3у + 0,4у + 0,7у = 0,8 + 1,4 + 0,6,1,4у = 2,8,у = 2,0,6 - (1,3х + 1) = 2,8х - 13,52,0,6 - 1,3х - 1 = 2,8х - 13,52,-1,3х - 2,8х = -13,52 - 0,6 + 1,-4,1х = -13,12,х = 3,2