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Simplifying z2 + 2z + -3 = z2 + 2z + -3 Reorder the terms: -3 + 2z + z2 = z2 + 2z + -3 Reorder the terms: -3 + 2z + z2 = -3 + 2z + z2 Add '3' to each side of the equation. -3 + 2z + 3 + z2 = -3 + 2z + 3 + z2 Reorder the terms: -3 + 3 + 2z + z2 = -3 + 2z + 3 + z2 Combine like terms: -3 + 3 = 0 0 + 2z + z2 = -3 + 2z + 3 + z2 2z + z2 = -3 + 2z + 3 + z2 Reorder the terms: 2z + z2 = -3 + 3 + 2z + z2 Combine like terms: -3 + 3 = 0 2z + z2 = 0 + 2z + z2 2z + z2 = 2z + z2 Add '-2z' to each side of the equation. 2z + -2z + z2 = 2z + -2z + z2 Combine like terms: 2z + -2z = 0 0 + z2 = 2z + -2z + z2 z2 = 2z + -2z + z2 Combine like terms: 2z + -2z = 0 z2 = 0 + z2 z2 = z2 Add '-1z2' to each side of the equation. z2 + -1z2 = z2 + -1z2 Combine like terms: z2 + -1z2 = 0 0 = z2 + -1z2 Combine like terms: z2 + -1z2 = 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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