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

4692 Views

See similar Maths 11 Plus tutors

Related Maths 11 Plus answers

All answers ▸

A round cake is shared between Abi, Elvira and Tina. The angle cut at the centre of the cake for each piece is that person’s age multiplied by 10. Abi 9 years old and Elvira is 14 years old. How old is Tina?


Express 3/(x+1) + 4x/(2x+5) as a single fraction.


How do I find the prime factors of a number?


How many thirds are there in 9?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences