Question

80+(5-x)=9+(-20)

Answer 1

80+(5-x)=9+(-20)

= 80 +( 5 - x ) = 11

= 5 - x = 11 - 80

= 5 - x = -69

= x = 5 - ( -69 )

x = 74

Answer 2

quên mình làm nhầm

80+(5-x)=9+(-20)

80 + ( 5-x) = -11

5-x = -11 - 80

5 - x = -91

x = 5 - ( -91 )

x = 96

Answer 3

80 + (5 - x) = 9 + (-20)

=> 80 + 5 - x = -11

=>85 - x = -11

=> -x = -11 - 85

=> -x = -96

=> x = 96 (T/m)

Vậy x = 96.