Question

[super ngu]

a   -12.(x-5)+7.(3-x)=5

 b.    x+{(x+3)-[(x+3)-(-x-2)]}=x

Giải nhanh nha mìn cần gấp

Answer 1

[Edogawa Conan]

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

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

=> -19x + 81 = 5

=> -19x = 5 - 81

=> -19x = -76

=> x = 4

b) x + {(x + 3) - [(x + 3) - (-x - 2)]} = x

=> (x + 3) - (x + 3 + x + 2) = 0

=> x + 3 - x - 3 -  x - 2 = 0

=> -x - 2 = 0

=> -x = 2

=> x = -2

Answer 2

[Pé Coca ( The Moon of Red )]

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

= 12x + 61 + 21 - 7x = 5

= 12x - 7x                = 5 - 61 - 21

= -19x                      = -76

=     x                      = 76 : ( -19)

=     x                       = 4