Răspuns :
a+b=6(a-b)
a+b=6a-6b
a-6a = -6b -b
-5a = -7b
5a=7b =k
a=k/5
b=k/7
b-11=(a+8):2
k/7 -11 = (k/5+8) :2
k/7 -11= (k+40)/10 aducem la acelasi numitor
10k - 770 = 7k+ 280
10k-7k=280+770
3k= 1050
k=350
a=350/5= 70
b=350/7=50
a+b=6a-6b
a-6a = -6b -b
-5a = -7b
5a=7b =k
a=k/5
b=k/7
b-11=(a+8):2
k/7 -11 = (k/5+8) :2
k/7 -11= (k+40)/10 aducem la acelasi numitor
10k - 770 = 7k+ 280
10k-7k=280+770
3k= 1050
k=350
a=350/5= 70
b=350/7=50
a+b=6(a-b)
a+b=6a-6b
a-6a = -6b -b
-5a = -7b
5a=7b =k
a=k/5
b=k/7
b-11=(a+8):2
k/7 -11 = (k/5+8) :2
k/7 -11= (k+40)/10 aducem la acelasi numitor
10k - 770 = 7k+ 280
10k-7k=280+770
3k= 1050
k=350
a=350/5= 70
b=350/7=50
a+b=6a-6b
a-6a = -6b -b
-5a = -7b
5a=7b =k
a=k/5
b=k/7
b-11=(a+8):2
k/7 -11 = (k/5+8) :2
k/7 -11= (k+40)/10 aducem la acelasi numitor
10k - 770 = 7k+ 280
10k-7k=280+770
3k= 1050
k=350
a=350/5= 70
b=350/7=50