0,3(6-3х)=4,5-0,8(х-9)

1. 0.3×6=1.8
2. 0.3×3х=0.9×
3. -0.8×х=0.8х
4. -0.8×9= 7.2
1.8-0.9х=4.5-0.8х+7.2
-0.9х+0.8х=4.5+7.2-1.8
-0.1х=9.9
х=-99