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Simplifying -5n + 21 + -15n + 7 = n + -63 Reorder the terms: 21 + 7 + -5n + -15n = n + -63 Combine like terms: 21 + 7 = 28 28 + -5n + -15n = n + -63 Combine like terms: -5n + -15n = -20n 28 + -20n = n + -63 Reorder the terms: 28 + -20n = -63 + n Solving 28 + -20n = -63 + n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-1n' to each side of the equation. 28 + -20n + -1n = -63 + n + -1n Combine like terms: -20n + -1n = -21n 28 + -21n = -63 + n + -1n Combine like terms: n + -1n = 0 28 + -21n = -63 + 0 28 + -21n = -63 Add '-28' to each side of the equation. 28 + -28 + -21n = -63 + -28 Combine like terms: 28 + -28 = 0 0 + -21n = -63 + -28 -21n = -63 + -28 Combine like terms: -63 + -28 = -91 -21n = -91 Divide each side by '-21'. n = 4.333333333 Simplifying n = 4.333333333
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