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Answer:
Step-by-step explanation:
1. 0.81x=40.5 ; divide both sides by .81 to isolate x
x=50
2. 3x=1.8 ; divide both both sides by 3
x=0.6 ; multiply 100 to get percentage
x=60%
3. 0.69(30)=x
x=20.7
4. 0.59x=23.6 ; divide both sides by 0.59
x=40
5. 0.75x=15 ; divide both sides by 0.75
x=20
6. 0.56x=3.92 ; divide both sides by 0.56
x=7
7. 0.29x=26.1 ; divide both sides by 0.29
x=90
8. 0.86(10)=x
x=8.6