Answer:
7
Step-by-step explanation:
n = 13
20= -6+2n
Add 6 to each side
20+6= -6+6+2n
26 = 2n
Divide each side by 2
26/2 = 2n/2
13 =n
the answer of 2x +y = 20 ; 6x -5y =12
{ explained in image}
3x+ -1
-x-2x= -x+ -2x
-x+ -2x= -3x
1-2= -1
Hope this helps
