Which is the best reason why step 1 is a good first step in the solution shown?` WILL GIVE BRIANELIST

Multiplying by 5 isolates the x on one side of the equation

Step-by-step explanation:

This is so you can solve for the variable x.  By isolating you get the get the variable on its own so you know what the varible itself is equal to, which in this case is 75.

Multiplying by 5 isolates x on one side of the equation

Step-by-step explanation:

When you solve equations like that, your goal is to get the variable by itself

Angle A and Angle D are congruent because angles of an equilateral triangle are congruent.

Side AD is equal to side AD because of the reflexive property

Side AC is congruent to side DB because components of sides are congruent

Therefore, Triangle ACD is congruent to Triangle DBA