Tìm số nguyên x biết: -2. (x + 6) + 6 . (x - 10) = 8

Bài 3. Tìm số nguyên x biết

a) -2. (x + 6) + 6 . (x - 10) = 8           b) – 4 . (2x + 9) – (- 8x + 3) – (x + 13) = 0

c) 2 . (5 + 3x) + x = 31                      d) (3x - 7) + 2. (5 – 2x) + 5x = 19

e) (4 – 2x) . (x - 3) =  0                      g) 7x . (x - 10) = 0

h) – x . (x + 7) . (x - 4) = 0                i) -2x - (-17) = 15  

k) 3.|2x2 - 7| =  33