Question

(7/12)-(-7/6+1/9-2)=?

Answer 1

Olá.
(7/12) - (-7/6 + 1/9 - 2)=mmc 6,9,1=18
7/12 - (-21 + 2 - 36/18)
7/12 - (- 55/18)
7/12 + 55/18 =mmc 12,18=36
21+110/36
131/36

Bons estudos.

Answer 2

(7/12) - (-7/6 + 1/9 - 2 )

7/12 + 7/6 - 1/9 + 2 

mmc(6, 9, 12) = 36

21/36 + 42/36 - 4/36 + 72/36 = 
135/36 - 4/36 = 131/36