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Simplifying 63 = -7(3n + -3) Reorder the terms: 63 = -7(-3 + 3n) 63 = (-3 * -7 + 3n * -7) 63 = (21 + -21n) Solving 63 = 21 + -21n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '21n' to each side of the equation. 63 + 21n = 21 + -21n + 21n Combine like terms: -21n + 21n = 0 63 + 21n = 21 + 0 63 + 21n = 21 Add '-63' to each side of the equation. 63 + -63 + 21n = 21 + -63 Combine like terms: 63 + -63 = 0 0 + 21n = 21 + -63 21n = 21 + -63 Combine like terms: 21 + -63 = -42 21n = -42 Divide each side by '21'. n = -2 Simplifying n = -2
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