Amusic teacher has 4 drum kits ,each kit has 2 drumsticks

What two criteria are needed for triangles to be similar

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 =

Can someone me out here and the tell me the greatest common factor