Question

Calculeaza 21-[a+(a:3+4)+a]=a:2 . Urgent
Multumesc

Answer 1

21-(a+$\frac{a+12}{3}$+a)=$\frac{a}{2}$
21-($\frac{3a+a+12+3a}{3}$)=$\frac{a}{2}$
126-(14a+24)=3a
126-14a-24=3a
102=17a
a=6