x:20=300
30:x-3=12
15×(30-x)=45

16:y=2
5×y-8=12
30×(9-y) =150

15×y=45
y:10+1=20
9×(15-y) =72

x:13=260
5×x+18=38
100:(10-y) =20

15×x=60
18:x-5=4
(x-30)×5=40

y:25=8
6×y+4=28
20:(y-3)=2

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