Here is the code peiced together with the includes removed
module Maths
function abs_value(x)
return x>0 ? x : -x
end
end
module Algebra
import ..Maths
function add_value(x)
return Maths.abs_value(x)+5
end
end
print(Maths.abs_value(-98))
Notice that ive changed .Maths to ..Maths because its in a parent module