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Simplifying 3n + 3(9n + -7) = -3(4 + -10n) + -9 Reorder the terms: 3n + 3(-7 + 9n) = -3(4 + -10n) + -9 3n + (-7 * 3 + 9n * 3) = -3(4 + -10n) + -9 3n + (-21 + 27n) = -3(4 + -10n) + -9 Reorder the terms: -21 + 3n + 27n = -3(4 + -10n) + -9 Combine like terms: 3n + 27n = 30n -21 + 30n = -3(4 + -10n) + -9 -21 + 30n = (4 * -3 + -10n * -3) + -9 -21 + 30n = (-12 + 30n) + -9 Reorder the terms: -21 + 30n = -12 + -9 + 30n Combine like terms: -12 + -9 = -21 -21 + 30n = -21 + 30n Add '21' to each side of the equation. -21 + 21 + 30n = -21 + 21 + 30n Combine like terms: -21 + 21 = 0 0 + 30n = -21 + 21 + 30n 30n = -21 + 21 + 30n Combine like terms: -21 + 21 = 0 30n = 0 + 30n 30n = 30n Add '-30n' to each side of the equation. 30n + -30n = 30n + -30n Combine like terms: 30n + -30n = 0 0 = 30n + -30n Combine like terms: 30n + -30n = 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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