How do I solve x-6=15?

To solve the equation means to make x the subject i.e. to make x on its own. Therefore, we need to add 6. If you add 6 to one side you must also add 6 to the other side. 

x-6+6 = 15+6

x = 21

So x=21.

PT
Answered by Pearl T. Maths tutor

14617 Views

See similar Maths GCSE tutors

Related Maths GCSE answers

All answers ▸

A ball, dropped vertically, falls d metres in t seconds. d is proportional to the square of t. The ball drops 45 metres in the first 3 seconds. How far does the ball drop in the next 7 seconds?


Rearrange the following to make m the subject: 4(m - 2) = t (5m +3)


[Higher] Simplify the following expressions: x^7 X x ^5 and (x^-2)^-3


A ship sets off on a bearing of 072 degrees from port and travels 3.4km in a straight line. How far north of the ship's starting position is its final position? Give your answer to two decimal places.


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:

© 2026 by IXL Learning