How do you solve the simultaneous equation, 7x – 20 = 3x + 4?

To solve this equation we want to find the value of one unknown, x. The solution will be x = ___. So first we need to put all the terms with x on one side of the =, and all the constants on the other side. To balance the equation, any operation we do, we have to do to both sides I would start by subtracting 3x from both sides, 7x – 20 – 3x = 3x + 4 -3x, 4x – 20 = 0 + 4 Then I would add 20 to both sides 4x – 20 + 20 = 4 +20, 4x = 24 Finally, to find the value of x, I would divide both sides by 4 x = 24

AA
Answered by Abisayo A. Maths tutor

4933 Views

See similar Maths 11 Plus tutors

Related Maths 11 Plus answers

All answers ▸

How do I find a fraction of a number?


When a price changes from £15 to £20. By how much percentage has the price changed?


I think of a number. I multiply it by 3 and then subtract 5. I get an answer of 16. What was the number I first thought of?


What is the difference between ratios and fractions?


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