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Simplifying 7(3z + 2) = 21z + 14 Reorder the terms: 7(2 + 3z) = 21z + 14 (2 * 7 + 3z * 7) = 21z + 14 (14 + 21z) = 21z + 14 Reorder the terms: 14 + 21z = 14 + 21z Add '-14' to each side of the equation. 14 + -14 + 21z = 14 + -14 + 21z Combine like terms: 14 + -14 = 0 0 + 21z = 14 + -14 + 21z 21z = 14 + -14 + 21z Combine like terms: 14 + -14 = 0 21z = 0 + 21z 21z = 21z Add '-21z' to each side of the equation. 21z + -21z = 21z + -21z Combine like terms: 21z + -21z = 0 0 = 21z + -21z Combine like terms: 21z + -21z = 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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