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Simplifying 3z + 13 = 13 + 3z Reorder the terms: 13 + 3z = 13 + 3z Add '-13' to each side of the equation. 13 + -13 + 3z = 13 + -13 + 3z Combine like terms: 13 + -13 = 0 0 + 3z = 13 + -13 + 3z 3z = 13 + -13 + 3z Combine like terms: 13 + -13 = 0 3z = 0 + 3z 3z = 3z Add '-3z' to each side of the equation. 3z + -3z = 3z + -3z Combine like terms: 3z + -3z = 0 0 = 3z + -3z Combine like terms: 3z + -3z = 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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