2(0,9х+1,4)+1,4(1,5+х)=х

2(0.9х + 1.4) + 1.4( 1.5 + х)= х
1.8х + 2.8х +  2.1 + 1.4х = х
1.8х + 2.8х + 1.4х + 1х = -2.1
7х = - 2.1
х = - 0.3