0,8x+1,4=0,4x-2,6 0,18x-3,54=0,19x-2,89 2 2/3x+3 2/15 = 3 1/5x+2 1/3

1) 0.8x+1.4 =0.4x -2.6 0.8x -0.4x = -2.6 -1.4 0.4x = -4 x= -4/0.4 x = -10 2) 0.18x -3.54 =0.19x -2.89 0.18x -0.19x = -2.89 +3.54 -0.01x =0.65 x = -65 3) 2 2/3 =8/3 3 2/15 =47/15 3 1/5 =16/5 2 1/3 =7/3 8/3x +47/15 =16/5x +7/3 8/3x -16/5x =7/3 -47/15 (8*5 -16*3)/15x =(7*5-47)/15 (40-48)/15x =(35-47)/15 -8/15x = -12/15 x =12/15 : 8/15 x =12/15 * 15/8 x =(12*15)/(15*8) x =12/8 x =3/2 x =1.5