What is x if 5x-14=215x−14=21? Algebra Expressions, Equations, and Functions Variable Expressions 1 Answer Rafael Oct 25, 2015 x=7x=7 Explanation: [1]" "5x-14=21[1] 5x−14=21 Add 14 to both sides. [2]" "5x-14+14=21+14[2] 5x−14+14=21+14 [3]" "5x=35[3] 5x=35 Divide both sides by 5. [4]" "(5x)/5=35/5[4] 5x5=355 [5]" "color(blue)(x=7)[5] 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+43x−x+4? How do you write a quotient of a number and 6 as an expression? How do you evaluate the expression 2x+12x+1 for x=1x=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 3278 views around the world You can reuse this answer Creative Commons License