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Simplifying (9 + -1z) * z = 9z + -1z2 Reorder the terms for easier multiplication: z(9 + -1z) = 9z + -1z2 (9 * z + -1z * z) = 9z + -1z2 (9z + -1z2) = 9z + -1z2 Add '-9z' to each side of the equation. 9z + -9z + -1z2 = 9z + -9z + -1z2 Combine like terms: 9z + -9z = 0 0 + -1z2 = 9z + -9z + -1z2 -1z2 = 9z + -9z + -1z2 Combine like terms: 9z + -9z = 0 -1z2 = 0 + -1z2 -1z2 = -1z2 Add 'z2' to each side of the equation. -1z2 + z2 = -1z2 + z2 Combine like terms: -1z2 + z2 = 0 0 = -1z2 + z2 Combine like terms: -1z2 + z2 = 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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