Question

What is the value of x - f(x)=-7 and f(x)=63

Answer 1

56

Explanation:

Given expression:

x - f(x) = -7

f(x) = 63

Unknown:

The value of x = ?

Solution:

We can easily solve this problem by simple substitution:

Since;

x - f(x) = -7

and f(x) = 63;

x - 63 = -7

x = -7 + 63

x = 56