Stiind ca x=14 calculati a +b:

a)7*a+7*b+7*x=700
b)39*a+39*b+39*x=3900
c)x*a+x*b=140
d)30*x-a-b=241
e)x*a+x*b+6*a+6*b=200
Dau coroana va rog