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Simplifying (13d) * 0 = 0 Remove parenthesis around (13d) 13d * 0 = 0 Reorder the terms for easier multiplication: 13 * 0d = 0 Multiply 13 * 0 0d = 0 Anything times zero is zero. 0d = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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