10 -2x = 90 - x

[Gringo123]

I can't work this one out. I need to find the vlaue of x

10 -2x = 90 - x

I come up with 3x = 80 which I know is wrong. This is how I get there:

10 -2x = 90 - x
10 -3x = 90
3x = 80

The actual answer is x= -80. Where am I going wrong?

[itr]

10-2x=90-x
10-x=90
-x=80
x=-80