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2014-07-13T14:06:43+03:00

15+ (X+2) + 21=47

15+(X+2)= 47-21

15 +(x+2)=26

X+2= 11

X=  9

2 4 2
2014-07-13T14:08:55+03:00
15+(x+2)+21=47

15+(X+2)= 47-21
 
15 +(x+2)=26
 
X+2= 11
 
X= 11-2
 
x=9
1 5 1