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Simplifying 4z + z = 5z Combine like terms: 4z + z = 5z 5z = 5z Add '-5z' to each side of the equation. 5z + -5z = 5z + -5z Combine like terms: 5z + -5z = 0 0 = 5z + -5z Combine like terms: 5z + -5z = 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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