Maths problem (1 Viewer)

[Lalaloop]

Hey guys, I just need help with this small maths problem...

How do you find the number to add a-b for it to become b-a?

Thank you so much!

(Basic Algebraic techniques)

I have an answer, but it could be wrong

 

[D94]

a-b+n = b-a

Solve for n.

 

[emilios]

a-b + x = b-a , where x is the unknown you're solving for.
Making x the subject;
x=2b-2a
x = 2(b-a)

 

[Lalaloop]

OH THANKS GUYS! Especially to emilios since his answer was there on my practise test!!!