book Maths Puzzle Numerical Ability

Use method to simplify each complex fraction

1. 12 / x -1 / 6 / x

2. 2/s - 3/t / 4t^2 - 9s^2 /st

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book Other Question

Increaing a number by five and then doubling the outcome is the same same as decresing the number by twelve I need to solve the following simultaneous linear equation:

(3/8x - 1/2y = 1) and (0.2x + 0.6y = 4)

I know the lines intersect at (8,4) but I can't get my work to show it. So