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Simplifying 5x(-3x) = -15x2 Remove parenthesis around (-3x) 5x * -3x = -15x2 Reorder the terms for easier multiplication: 5 * -3x * x = -15x2 Multiply 5 * -3 -15x * x = -15x2 Multiply x * x -15x2 = -15x2 Add '15x2' to each side of the equation. -15x2 + 15x2 = -15x2 + 15x2 Combine like terms: -15x2 + 15x2 = 0 0 = -15x2 + 15x2 Combine like terms: -15x2 + 15x2 = 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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