Tìm x € Z biết:

Question

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

Answer 1

-12x - { - 60 } + 21 - 7x = 5

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

{ - 12x - 7x } + 60 + 21 = 5

-19x + 81 = 5

-19x = 5 - 81

-19x = -76

x = -76 : { - 19 }

x = 4