Tìm x

tìm x 
1/16+6x( 7- X ) : 3 =22
2/ 16-2x(7-X) : 3 -5 =9
3/20-12:(6-X) x 2-4=10 
4/21+20: (2xX-1 ) -5=20
5/31 -30:(3xX-1)-4=21
5/42-40:(5xX-1)x2-2=20
6/42-36:(6:X-1)-2=22
7/36:(15-12:X)-2=1
8/42:(24-12:X)+5 =7
9/50-40:(25-15:X) -8 =40 
10/60-40:925-15:Xx3)-7=50