Question

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

Answer 1

<=>(-12)(x-5)+7(3-x)=-(19x-81)

=>-(19x-81)=5

=>81-195

=>-19x=-76

<=>-19 x= -19.4 (rút gọn -19)

=>x=4

Answer 2

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

<=>(-12x)-(-60)+21-7x=5

<=>(-12x)+60+21-7x=5

<=>(-12x-7x)=5-(60+21)=-76

<=>-19x=-76<=>x=4

 vậy x=4

Answer 3

- 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