Basically, no. Voltage is relative and you can regard the +18V side as +9V and the 0V side as -9V, but that only gives you two voltage rails and you need a third — 0V.
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Basically, no. Voltage is relative and you can regard the +18V side as +9V and the 0V side as -9V, but that only gives you two voltage rails and you need a third — 0V.