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Simplifying 5n + -18 + -1n = 2(2n + -9) Reorder the terms: -18 + 5n + -1n = 2(2n + -9) Combine like terms: 5n + -1n = 4n -18 + 4n = 2(2n + -9) Reorder the terms: -18 + 4n = 2(-9 + 2n) -18 + 4n = (-9 * 2 + 2n * 2) -18 + 4n = (-18 + 4n) Add '18' to each side of the equation. -18 + 18 + 4n = -18 + 18 + 4n Combine like terms: -18 + 18 = 0 0 + 4n = -18 + 18 + 4n 4n = -18 + 18 + 4n Combine like terms: -18 + 18 = 0 4n = 0 + 4n 4n = 4n Add '-4n' to each side of the equation. 4n + -4n = 4n + -4n Combine like terms: 4n + -4n = 0 0 = 4n + -4n Combine like terms: 4n + -4n = 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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