exam Maths Puzzle Numerical Ability

Find the inverse of f(x)=7x-2.

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expressions/53089 (2006-09-21 00:55:06): I need to justify each of these step, please help me with this.
5(n+4)+9n= (5n+20)+9n
=5n+(20+9n)
=5n+(9n+20)
=(5n+9n)+20
=(5+9)n+20
=14n+20 how would i do this? Simplify the following fractions by putting them in lowest terms or by performing the indicated operations.

a-ab over a2 divided by a-1 over a cubed