It could be anything you like - counting numbers, integer, rational numbers, real number, complex numbers or any subset of these. Each domain would give rise to a different range.
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If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.
[5x+13]
7
y = 5x + 9
5x - y + 1 = 0