exam Maths Puzzle Numerical Ability

Graph on a number line

- absolute value of x - 2 > - 5; d = intergers

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exam Other Question

I'm just beginning to do proofs. How do I even begin? Please explain a systematic method to set up a proof. The cramer's rule for solution of the problem below:
a1x+b1y+c1z=k1
a2x+b2y+c2z=k2
a3x+b3y+c3z=k3