Need to translate verbal phrases and sentences into variable expressions You 'll write variable expressions d. 3 is equal to twice the sum of a number and 2. 3 2 y. 2 . EXAMPLE 3 Writing and Write and solve an equation to find the..Writing Alge.ic Equations is presented by Math Goo.s. We can subtract 17 from both sides of the equation to find the value of x. 350 - d = 280 Summary: An alge.ic equation is an equation that includes one or more variables..You will learn how to solve equations mentally by using the multiplication table and you will also learn how to identify a solution to an equation with given . - it is important because you need to recognize what it is that you are you define it, and it lets you know how to properly write the equation. In this case the variables are: s.d, we 'll it s, distance traveled it d and the .