Решите уравнение. 1. 2x+3x+ 40=90 2 (x+40)-30=50
3. 70+(60-y)=130
4.420-6x=240
5.-60:x=0,3
6. -2+y=4,3
7. 15-3x=-6
8. 180:3=x:2
9.(4x+3)*(x - 9)=0
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