Question

c*(3+d)=140 si c*d=125 sa se afle c

Answer 1

c·(3+d)=140
c·d=125
c=?

c·(3+d)=140       (desfacem paranteza)
c·3+c·d=140      (c·d=125, inlocuim)
3·c +125 = 140
3·c=140-125
3·c=15
c=15:3

c=5

Answer 2

C*(3+d)=140
3c +cd =140
3c + 125 = 140
3c = 140 - 125
3c = 15 ⇒ c = 15 :3 
                 c = 5