Question

tìm x thỏa mãn

-12(x-5)+7(3-x)=5

Answer 1

- 12.( x - 5 ) + 7.( 3 - x ) = 5

=> - 12x + 60 + 21 - 7x = 5

=> ( - 12x - 7x ) + 60 + 21 = 5

=> - 19x + 81 = 5

=> - 19x = 5 - 81

=> - 19x = - 76

=> x = ( - 76 ) : ( - 19 )

=> x = 4

Vậy x = 4

Answer 2

-12.x(-12).5+7.3-7.x=5

 x(-12-7)-(-12).5+7.3=5

x.(-19)+60+21=5

x.(-19)+81=5

x.(-19)=5-81

x.(-19)=-76

x        = -76:(-19)

x        =4