Answer:
-7.5x3+(20+2.5)=0
this one is equal to 0 ;)
The equation: n - 4 = -15
Now let's solve our equation for n.
n - 4 = -15
Add 4 to both sides.
n = -11
Since the values are the same on both sides the matrix value is a=1
X=20
y=60
z=40
I guess this is true
