Remove the brackets and simplify.

a) [[$ 2(x+1) - 3(x+2) = $]]

b) [[$ -x(x-4) + 2(x+3) = $]]

c) [[$ -(x-1) + 3(-x+1) = $]]

d) [[$ 3x(x-2) - 3(x^2 -x) = $]]