Find the number such that when 3 over 4 of it is added to 7 over 2 the sym is the same as when 2 over 3 of it is subtracted from 13 over 2

Darragh has a golden eagle coin in his collection with a mass of 13.551\,\text{g}13.551g. an uncirculated golden eagle coin has a mass of 13.714\,\text{g}13.714g.

How do you figure out which order to do two step equations in? like which thing do you subtract/add/multiply/divide first? i understand that you do the opposite of whatever's shown on the opposite side, but when?

The diagram shows some steps in the construction of the inscribed circle of abc. which diagram shows the next step in the construction?