1. 2*x+3*x+40 = 90

2. (х+40)-30=50

3. 70+(60-у)=130

4. 420-6х=240

5. -60:х=0,3

6. -2+у=4,3

7. 15-3х=-6

8. 180:3=х:2

9. (4х+3)(х-9)=0

10. |х-5|=3

 

Заранее спасибо)

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