book Maths Puzzle Numerical Ability

Simplify: (Use either method.)

X - (x+3)

6
_______
5/6 - 5/3x

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book Other Question

I hope this works. I've tried dozens, adn all of them say its simple but dont give me an explanation, A SIMPLE ONE. I would like to know what is the method to solve an equation wh solve the linear inequality.
-4(x+5)>7x+20