exam Maths Puzzle Numerical Ability

Tell wheather the given value of the varible is a solution of the equation.
-2(3x+7)=-3(2x+8);x=-5.

Thanks u for all the help!

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exam Other Question

I'm stuck: with 2 problems
x^3 - 5 = 3

3 3x - 2
- =1 -------
4 x + 1

would the common denominator be 4(x+1)? but that doesn't make sense ...I'm lost Find the value of the polynomial.

-x2 + 3x - 1 when x = 4.