What is 1.86 divided by 0.15 and why?

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 =

How to do this , and can some one explain

What is the similarity ratio of a cube with volume 729m^3 to a cube with volume 3375 m^3