Removes part of expression containing variable
Yacas' Solve(eq, x) can return e.g.
x == expr and {x == expr1, x == expr2, ...}.
Some usages are easier if the initial x ==  part is removed.
This is the purpose of this function.
stripvar(expr, var)
expr | 
 Expression where   | 
var | 
 Name of variable, e.g.   | 
Expression with left-hand side removed
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