F(x)=-5

write a new equation

f(2x)

f(2x) = -5

Step-by-step explanation: Here we know that the function f(x) = -5

this means that the function is a constant function, it does not depend on the value of x that is introduced in it.

Then if we evaluate it in 2x, the result is the same (again, it does not depend on the value of x)

f(2x) = -5

answer:      

step-by-step explanation:

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9