How do you solve x+3(x+4)=20? Algebra Linear Equations Multi-Step Equations with Like Terms 1 Answer Noah G May 31, 2016 You have to expand the equation. Explanation: x + 3x + 12 = 20 4x + 12 = 20 4x = 20 - 12 4x = 8 x = 2 Hopefully this helps! Answer link Related questions How do you solve multi step equations by combining like terms? How do you solve multi step equation w + w + 12 = 40? How do you solve 3p + 4p + 37 = 79? How do you solve for f: f-1+2f+f-3=-4? How do you combine like terms? How do you combine like terms for -7mn-2mn^2-2mn + 8? How do you combine like terms for 3x^2 + 21x + 5x + 10x^2? What is a term? How do you solve 3v+5-7v+18=17? How do you solve for x in 5x + 7x = 72? See all questions in Multi-Step Equations with Like Terms Impact of this question 2522 views around the world You can reuse this answer Creative Commons License