Round to the nearest ten i dont get it

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

Which of the choices shown could be used to prove that aacp=abcp ?