Four less than the product of a number and 7 is eight more than that number

Which fraction below is equivalent to 10/12?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial