[R] Forcing zero intercept in two predictor case - stat question not R question

[Leeds, Mark (IED)]

When one is doing simple regression and needs to force a zero intercept
( for whatever reason. I realize it's a controversial issue ), 
then subtracting the means of the left hand side and the right hand side
from themselves does the trick. Does anyone know if there is a 
similar trick when the RHS has two variables ? Thanks.
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