Question

afla valoarea numarului necunoscut:3*dechidem paranteza dreapta 8+2*(5*c+27ampartit la 3)anchidem paranteza dreapta si esteegal cu 168vreau desfasurat fiecare operatiie va rog mult 

Answer 1

3[8+2(5c+9)]=168
8+2(5c+9)=168/3
8+2(5c+9)=56
2(5c+9)=56-8
2(5c+9)=48
5c+9=48/2
5c+9=24
5c=24-9
5c=15
c=3

Answer 2

3*[8+2*(5*c+27:3)]=168
3*(8+10*c+2*9)=168
3*(8+10c+18)=168
3(10c+26)=168
30c+78=168
30c=168-78
30c=90
c=90:30
c=3