(7×(2a+4)+30+5×(200-(5×4×(6-2)))÷14= 50

Răspuns :

{7*[2a+4]+30+5*[200-(5*4*(6-2)]}:14=50
{7*(2a+4)+30+5*[200-(20*4]}=50*14
{7*(2a+4)+30+5*[200-80]}=700
{7*(2a+4)+30+5*120}=700
14a+28+30+600=700
14a+658=700
14a=700-658
a=42:14
a=3