book Maths Puzzle Numerical Ability

16(x+3)=-4(-3-4x)

I need to know the anwser.

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book Other Question

on the coordinate line L contains points (-3,-4)and(9,2)

What is the slope of line L? Show or explain your answer.
Ok, so I'm given 3 points of a parabola :(9,16) (0,12), and (27,0)..(9,16) is the vertex, (27,0) is an x-intercept, and (0,12) is the y-intercept. It can be inferred that (-9,0) is