Tìm x ∈ Z biết: a, 5x - 16 - 40 - x = 0

a, 5x - 16 - 40 - x = 0

4x =56

x = 14

b, 2x + (x - 11) = 14

2x + x + 11 = 14

3x = 3

x = 1

c, -6x - (2x + 1) = -65

-6x - 2x - 1 = -65

-8x = - 64

x = 8

d, -21.(2x + 3) - 58.(x - 3) = 211

-42x - 63 -58x + 174 = 211

-100x = 100

x = -1

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