book Maths Puzzle Numerical Ability

how do u solve : Graph the soulution set if the domain is { -2, -1, 0 , 2, 4} problem : 3x-y=10

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book Other Question

How would I solve by first eliminating the fractions?

x/2 - x/3 = 5
Factor completely the polynomial, and indicate any that are not factorable using integers.

105n^3+261n^2+66n