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Simplifying 2(5z + 15) = 2(5z + 15) Reorder the terms: 2(15 + 5z) = 2(5z + 15) (15 * 2 + 5z * 2) = 2(5z + 15) (30 + 10z) = 2(5z + 15) Reorder the terms: 30 + 10z = 2(15 + 5z) 30 + 10z = (15 * 2 + 5z * 2) 30 + 10z = (30 + 10z) Add '-30' to each side of the equation. 30 + -30 + 10z = 30 + -30 + 10z Combine like terms: 30 + -30 = 0 0 + 10z = 30 + -30 + 10z 10z = 30 + -30 + 10z Combine like terms: 30 + -30 = 0 10z = 0 + 10z 10z = 10z Add '-10z' to each side of the equation. 10z + -10z = 10z + -10z Combine like terms: 10z + -10z = 0 0 = 10z + -10z Combine like terms: 10z + -10z = 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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