Question

Aflatil pe x

X+3 supra 7 =12 supra 7
4 supra 9 +1supra9 +x= 8 supra 9

19 supra 25 - ( 2 supra 25+ 7 supra 25+ x) = 4 supra 25

Answer 1

x+3/7=12/7
x=9

4/9+1/9+x=8/9
x=3/9

19/25-(2/25+7/25+x)=4/25
19/25-(9/25+x)=4/25
15/25=9/25+x
x=6/25