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Simplifying 2z + 18 = 2(z + 9) Reorder the terms: 18 + 2z = 2(z + 9) Reorder the terms: 18 + 2z = 2(9 + z) 18 + 2z = (9 * 2 + z * 2) 18 + 2z = (18 + 2z) Add '-18' to each side of the equation. 18 + -18 + 2z = 18 + -18 + 2z Combine like terms: 18 + -18 = 0 0 + 2z = 18 + -18 + 2z 2z = 18 + -18 + 2z Combine like terms: 18 + -18 = 0 2z = 0 + 2z 2z = 2z Add '-2z' to each side of the equation. 2z + -2z = 2z + -2z Combine like terms: 2z + -2z = 0 0 = 2z + -2z Combine like terms: 2z + -2z = 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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