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Simplifying 4z + 9 = 4z + 9 Reorder the terms: 9 + 4z = 4z + 9 Reorder the terms: 9 + 4z = 9 + 4z Add '-9' to each side of the equation. 9 + -9 + 4z = 9 + -9 + 4z Combine like terms: 9 + -9 = 0 0 + 4z = 9 + -9 + 4z 4z = 9 + -9 + 4z Combine like terms: 9 + -9 = 0 4z = 0 + 4z 4z = 4z Add '-4z' to each side of the equation. 4z + -4z = 4z + -4z Combine like terms: 4z + -4z = 0 0 = 4z + -4z Combine like terms: 4z + -4z = 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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