Tìm x biết rằng

a, -12 + 3 (-x +7) = -18
b, -45 : 5 (-3+2x) = 3
c, 3x - 28 = x + 36
d, ( -162 ) mũ 2 - x = 56 + 100 . 15x 
e, 100 ( x-1 )
f, ( x+5) : ( x-2)
g, (3x + 8) : (x-1)