3,8-1,5х+(4,5-0,8)=2,4х+3

3.8-1.5х+(4.5-0.8)=2.4х+3
3.8-1.5х+4.5-0.8=2.4х+3
2.4х+1.5х=3.8-3+4.5-0.8
3.9х=4.5
х=4.5:3.9
х=одна целая 2/13(/-дробь)