What is the value of x in the equation 2.5(6x - 4) = 10 + 4(1.5 +0.50) ?

Use the function nest to evaluate p(x) = 1 + x + · · · + x50 at x = 1.00001. (use the matlab ones command to save typing.) find the error of the computation by comparing with the equivalent expression q(x) = (x51 − 1)/(x − 1).

I'm confused on this could anyone me and show me what i need to do to solve it.

2x minus y equals 6, x plus y equals negative 3