\(2\cdot\left(x-1\right)+3\cdot\left(x-2\right)=0\\ \Rightarrow2x-2+3x-6=0\\ \Rightarrow5x-8=0\\ \Rightarrow5x=0+8\\ \Rightarrow5x=8\\ \Rightarrow x=\dfrac{8}{5}\)

`a, 7/?`

`b, 4/5 + 7/10 -1/2`

`= 8/10 +7/10 - 5/10`

`= (8+7-5)/10`

`= 10/10`

`=1`

__

`c, 6/9 : (2/3:3)`

`= 2/3 : ( 2/3 xx 1/3)`

`= 2/3 : 2/9`

`= 2/3 xx 9/2`

`= 18/6`

`= 3`

e tách ra nhé.☘