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Simplifying -21 + -1n = -7(-4n + 3) Reorder the terms: -21 + -1n = -7(3 + -4n) -21 + -1n = (3 * -7 + -4n * -7) -21 + -1n = (-21 + 28n) Add '21' to each side of the equation. -21 + 21 + -1n = -21 + 21 + 28n Combine like terms: -21 + 21 = 0 0 + -1n = -21 + 21 + 28n -1n = -21 + 21 + 28n Combine like terms: -21 + 21 = 0 -1n = 0 + 28n -1n = 28n Solving -1n = 28n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-28n' to each side of the equation. -1n + -28n = 28n + -28n Combine like terms: -1n + -28n = -29n -29n = 28n + -28n Combine like terms: 28n + -28n = 0 -29n = 0 Divide each side by '-29'. n = 0 Simplifying n = 0
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