Hey Aarya!
If we `scale` both the numerator and denominator by the same value, then we can create other equivalent fractions. By scale I mean: Multiply both the top and bottom of the fraction by the same value.
So here is one we can try.
Let's multiply numerator and denominator by 3.

Yay we did it! We found another fraction which is equivalent to 3/8.
Answer:
x = 2.2
Step-by-step explanation:
Comment
f(x) = g(x) I don't think has any meaning for this question. I will just solve the equation.
Solution
7x - 12 = - 3x + 10 Add 3x to both sides
7x + 3x -12 = - 3x + 3x +10 Combine
10x - 12 = 10 Add 12 to both sides
10x -12 + 12 = 10 + 12 Combine
10x = 22 Divide by 10
10x/10 = 22/10
x = 2.2
Numerical because its the number of assistants.