Tìm x biết: a, (x + 6)^2 = 144; b, 2x(x - 7) - 2x + 14 = 0; c, (5 - x)(5 + x) + x(x - 1) - 9 = 0

Tìm x biết:
a, (x+6)^2=144
b, 2x(x-7)-2x+14=0
c, (5-x)(5+x)+x(x-1)-9=0
d, x^3+27(x+3)(x-9)=0