Question

Tìm x:
-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 - 5) + 7(3 - x) = 5

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

=> -12(x - 5) + (-7)(x - 5) + (-14)= 5

=> (x - 5)(-12 - 7) = 19

=> (x - 5).(-19) = 19

=> x - 5 = -1

=> x = 4