[R] Multiple linear regression with constraint (imposition)

[CE.KA]

Hi R users

I want to do a multiple linear regression with R

With a normal model (Y=Cste+A1*X1+A2*X2) the program would be
lm(Y ~X2+X2)

My model is Y=Cste+A1*X1+A2*X2 with the constraint A1=-A2
What is the program for such a model?

Best regards

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