TryGatherExponentialsOfOneLinearForm​(AngouriMath.​Entity,​AngouriMath.​Entity.​Variable,​System.​Boolean,​System.​Collections.​Generic.​Dictionary{AngouriMath.​Entity,​PeterO.​Numbers.​EInteger}@,​AngouriMath.​Entity@,​AngouriMath.​Entity@)

Every x of expr in an exponential e^(k y) with
k a whole number and y one linear form c + d x shared by all of
them -- coth(c + d x) is written with e^(2c + 2d x) -- and in nothing
else: each exponential node with its k, the form y scaled so that the
k are whole and coprime -- or, with unitX and a whole
number for the slope, y as x itself plus the offset over the slope
and each k the slope as written -- and dx/dy; false where the exponentials are of two forms, or an exponent is not linear in x.