B, X – 273 = 544A, X + 163 = 791X = 544 + 273X = 791 – 163X = 628X = 8...

Bài 2:

b, X – 273 = 544

a, X + 163 = 791

X = 544 + 273

X = 791 – 163

X = 628

X = 817

c, X x 3 = 81

X = 81 : 3

X = 27