Răspunsuri

2014-09-26T15:09:59+03:00
5y-97=943    
5y=943+97
5y=1040
y=208

14x(12-X)=70
168-14x=70
168-70=14x
98=14x
x=7

 3x(X+7)=75
3x+21=75
3x=75-21
3x=54
x=18