Respuesta :

miljanamilovanovic12

Answer:

X=3

A=4

B=5

Step-by-step explanation:

12a+15b+9c=

3*4*a+3*5*b+3*3*c=

3(4a+5b+3c) then

X=3

A=4

B=5

hrdkg
XA = 12
XB = 15
3X = 9
*
3X = 9
X = 9/3
X = 3
*
XA = 12
3A = 12
A = 12/3 = 4
*
XB = 15
3B = 15
B = 15/3 = 5