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Simplifying 7(z + 4) = 7z + 28 Reorder the terms: 7(4 + z) = 7z + 28 (4 * 7 + z * 7) = 7z + 28 (28 + 7z) = 7z + 28 Reorder the terms: 28 + 7z = 28 + 7z Add '-28' to each side of the equation. 28 + -28 + 7z = 28 + -28 + 7z Combine like terms: 28 + -28 = 0 0 + 7z = 28 + -28 + 7z 7z = 28 + -28 + 7z Combine like terms: 28 + -28 = 0 7z = 0 + 7z 7z = 7z Add '-7z' to each side of the equation. 7z + -7z = 7z + -7z Combine like terms: 7z + -7z = 0 0 = 7z + -7z Combine like terms: 7z + -7z = 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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