x+2.8=3.72+0.38 4.1+y=20.3-4.9 z-6.8=8.7+6.4 10-v+4.3=10.7

1)x+2.8=3.72x=3.72-2.8x=0.922)4.1+y=20.3-4.9y=20.3-4.9-4.1y=11.33)z-6.8=8.7z=8.7-6.8z=1.94)10-v+4.3=10.7-v=10.7-10-4.3-v=-3.6v=3.6

х+2.8=3.72+0.38х+2.8=4.1х=1.34.1+у=20.3-4.94.1+у=15.4у=11.3z-6.8=8.7+6.4z-6.8=15.1z=21.910-v+4.3=10.714.3-v=10.7-v=13.6v=-13.6