a ) -3x - 61 = 5 b) 51 - (-12 + 2x) = 27 c) 72 : ( x - 2)2 =8
-3x = 5 + 61 - 12 + 2x = 51 - 27 ( x-2 )2 = 72 : 8
-3x = 66 - 12 + 2x = 24 ( x - 2)2 = 9
x = 66 : (-3) 2x = 24 - ( -12) ( x - 2)2 = 32
x = -22 2x = 24 + 12 => x - 2 = 3
Vậy x = -22 2x = 36 x = 3+2
x = 36 : 2 x = 5
x = 18 Vậy x = 5
Vậy x = 18