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Simplifying (3ab)(-5ab) = -15a2b2 Remove parenthesis around (3ab) 3ab(-5ab) = -15a2b2 Remove parenthesis around (-5ab) 3ab * -5ab = -15a2b2 Reorder the terms for easier multiplication: 3 * -5ab * ab = -15a2b2 Multiply 3 * -5 -15ab * ab = -15a2b2 Multiply ab * ab -15a2b2 = -15a2b2 Add '15a2b2' to each side of the equation. -15a2b2 + 15a2b2 = -15a2b2 + 15a2b2 Combine like terms: -15a2b2 + 15a2b2 = 0 0 = -15a2b2 + 15a2b2 Combine like terms: -15a2b2 + 15a2b2 = 0 0 = 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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