Răspuns :
3(a-b)=b
3a-3b=b
3a=b+3b
3a=4b
a=4b/3
a+b=728
4b/3+b=728 aducem la acelasi numitor
4b+3b=2184
7b=2184
b=312 a=416
3a-3b=b
3a=b+3b
3a=4b
a=4b/3
a+b=728
4b/3+b=728 aducem la acelasi numitor
4b+3b=2184
7b=2184
b=312 a=416
a+b=728
b-a=a : 3
b = a : 3 + a
a + a:3 + a = 728
2a + a:3 = 728
6a+a=728*3
7a=2184
a=312
b=728-312
b=416
b-a=a : 3
b = a : 3 + a
a + a:3 + a = 728
2a + a:3 = 728
6a+a=728*3
7a=2184
a=312
b=728-312
b=416