Ez question unit and proportions??

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

1/4x+5=3/4. i can't get access to the answer to this question! and, my request on "contact us" will not go