Help!! Whats the equations for the four boxes??!

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 =

What is the value of x when x + 7 = 21?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?