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.

Answered by Pearl T. Maths tutor

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