Write the expression 6a in words
Write the expression 3x+7 in words
Six multiplied by a variable
Three multiplied by a variable plus seven
Three multiplied by a variable plus seven
could also be 3(x+7)
Better might be
seven added to the product of three and a variable
To write the expression 6a in words, you can say "six times a."
To write the expression 3x+7 in words, you can say "the sum of three times x and seven."