Verified answer

9,5х-3,2х-1,8х=6,9-3,75

4,5х=3,15

х=3,15:4,5

х=0,7

9,5x-(3.2x+1.8x)+3.75=6.9

3.2х+1.8х=5х

9.5х-5х=4.5х

6.9-3.75=3.15

4.5х=3.15

х=3.15/4.5

х=0.7