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