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Simplifying (21w7z)(0) = 0 Remove parenthesis around (21w7z) 21w7z(0) = 0 Reorder the terms for easier multiplication: 21 * 0w7z = 0 Multiply 21 * 0 0w7z = 0 Anything times zero is zero. 0w7z = 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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