book Maths Puzzle Numerical Ability

I need help finding the value of x in the problem 7(x - 3)= 4(x = 5). Can you please walk me through the steps.

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book Other Question

I have been given 2 partitioned matrices, each is 3x3, one the inverse of the other.


I 0 0 | I 0 0
C I 0 | Z I 0
A B I |
Let f(x) = 2x + 1 and g(x) = x^2 - 4 and find the following:

(fg)(x)

(g of f)(x)