Question

Daca a+3xb=18 , determinati numarul x din fiecare caz :
a). x+3*a+9*b=200;
b). x*a+3*b*x=54.

Answer 1

x+3(a+3b)=200 ⇒ x+3·18=200 ⇒ x+54=200 ⇒x=200-54 ⇒x=146
x(a+3b)=54 ⇒ x ·18=54 ⇒x=54:18 ⇒x=3

Answer 2

a+3xb=18
a) x+3xa+9xb=200
    x+3(a+3b)=200
    x+3x18=200
    x+54=200
     x=200-54
     x=146
b)   x*a+3*b*x=54
      x*(a+3b)=54
      x*18=54
      x=54:18
      x=3