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Simplifying 123456789 * 987654321 * 123 * 0 * 456 * 0 * 789 = 0 Multiply 123456789 * 987654321 121932631100000000 * 123 * 0 * 456 * 0 * 789 = 0 Multiply 121932631100000000 * 123 14997713630000000000 * 0 * 456 * 0 * 789 = 0 Multiply 14997713630000000000 * 0 0 * 456 * 0 * 789 = 0 Anything times zero is zero. 0 * 456 * 0 * 789 = 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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