exam Maths Puzzle Numerical Ability

I need your help solving this equation w/4-21=-3

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exam Other Question

Please simplify this rational expression and show all steps to achieve the answer. (* means to multiply per instructor)

x-6/x+2*2x-1/x-6/x-2/x+2
Can you explain and figure it out for me of how to graph an equation in the form of y=mx+b.I need to know how to do this later.

y=2x-3