What is x if #5x-14=21#? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer Rafael Oct 25, 2015 #x=7# Explanation: #[1]" "5x-14=21# Add 14 to both sides. #[2]" "5x-14+14=21+14# #[3]" "5x=35# Divide both sides by 5. #[4]" "(5x)/5=35/5# #[5]" "color(blue)(x=7)# Answer link Related questions How do you write the variable expression for: a quotient of 2 and the sum of a number and 3 ? What are variables? What are variable expressions? How do you write variable expressions? How do you evaluate variable expressions? How do you simplify the expression #3x-x+4#? How do you write a quotient of a number and 6 as an expression? How do you evaluate the expression #2x+1# for #x=1#? How do you write a product of a number and 2 as an expression? How do you write 5 less than 2 times a number as a variable expression? See all questions in Variable Expressions Impact of this question 2487 views around the world You can reuse this answer Creative Commons License