book Maths Puzzle Numerical Ability

can you please help me with this {4a+2u+i=2
5a+3u+2i=17
a-5u =3

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book Other Question

Find three real numbers that divide the real number line between x/3 and 3x/4 into four parts.

Thanks. Find all points having an x -coordinate of 2 whose distance from the point (-2,-1) is 5? I think it uses distance formula or a midpoint formula.