exam Maths Puzzle Numerical Ability

2x+1 - 3x+4 = 5x-9
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3 6 9

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exam Other Question

how do i work out the number of sides in a shape when i am given the exterior angle of 15? Is (x-2) a factor of 3x^4+6x^3-30x^2+16x-8? Why or Why not?