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