Thanks for the question.  z is between 0 and 1. And X is greater than one.  I am having trouble figuring out how to set the ranges for r,d,z and x.  I thought I could do this with

solve({equation},{variables},{r=0..1,d=0..1,z=0..1,x>0})

But I get an error  -Error, (in solve) invalid arguments - when I do this. Do you know another way to set the ranges for variables?   Thanks for your help

Thanks for the question.  z is between 0 and 1. And X is greater than one.  I am having trouble figuring out how to set the ranges for r,d,z and x.  I thought I could do this with

solve({equation},{variables},{r=0..1,d=0..1,z=0..1,x>0})

But I get an error  -Error, (in solve) invalid arguments - when I do this. Do you know another way to set the ranges for variables?   Thanks for your help