Question

Tìm x:

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

Answer 1

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

=> -12.x - - 12.5 + 7.3 - 7.x=5

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

=> -12x - 7.x = -60 + -21+5 ( quy tắc chuyển vế)

=> -19x= - 76

=>x= - 76 : -19=4

Answer 2

-12x - (-60) + 7x - 3 = 5

=> -12x + 60 + 7x - 3 = 5

=> -12x + 7x +(60-3)=5

=> -5x + 57 = 5

=>-5x=5-57

=> 

Answer 3

=> -12x - (-60) + 7x - 3 = 5

=> -12x + 60 + 7x - 21 = 5

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

=> -5x + 39 = 5

=>-5x=5-39 

Answer 4

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

=> -12.x - - 12.5 + 7.3 - 7.x=5

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

=> -12x - 7.x = -60 + -21+5 ( quy tắc chuyển vế)

=> -19x= - 76

=>x= - 76 : -19

=4