Solve the equation 3(x+1) = 21

When solving an equation with brackets, it is often easiest to expand the brackets first.3(x+1) = 21becomes...3x + 3 = 21Now this looks like an equation we know how to solve(minus three from both sides)3x + 3 - 3 = 21 - 3becomes...3x = 18divide both sides by 3...x = 6

JM
Answered by James M. Maths tutor

4549 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

From June 2015 Edexcel paper: Solve 7x + 8 = 2x – 3


x = 0.436363636... . Prove algebraically that x can be written as 24/55.


Write 0.72727272 as a fraction in its simplest form


Determine the next two terms in this sequence: 2, 7, 9, 16, 25, ... , ...


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning