exam Maths Puzzle Numerical Ability

If 12 is subtracted from three times a number and the difference is multiplied by 2, the result is -42. Find the number.

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instructions:

Graph in a coordinate plane
17. y<2x^2-4x+1

i have no idea how to simplify nor graph.. how do i simplify the following; 2x^6 -6x^4 +4x^3 / 2x^5