Răspuns :
a-b=200
a=5b
inlocuim a⇒5b-b=200
4b=200
b=200/4
b=50
a=5*50
a=250
a=5b
inlocuim a⇒5b-b=200
4b=200
b=200/4
b=50
a=5*50
a=250
a - b = 200
a = 5b
b = a : 5
------------------
5b - b = 200
4b = 200
b = 200 : 4
b = 50
a = 5 x 50
a = 250
250 - 50 = 200
a = 5b
b = a : 5
------------------
5b - b = 200
4b = 200
b = 200 : 4
b = 50
a = 5 x 50
a = 250
250 - 50 = 200