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Simplifying 3n2 + -15n = 3n2 + n + -18n + -5 Reorder the terms: -15n + 3n2 = 3n2 + n + -18n + -5 Reorder the terms: -15n + 3n2 = -5 + n + -18n + 3n2 Combine like terms: n + -18n = -17n -15n + 3n2 = -5 + -17n + 3n2 Add '-3n2' to each side of the equation. -15n + 3n2 + -3n2 = -5 + -17n + 3n2 + -3n2 Combine like terms: 3n2 + -3n2 = 0 -15n + 0 = -5 + -17n + 3n2 + -3n2 -15n = -5 + -17n + 3n2 + -3n2 Combine like terms: 3n2 + -3n2 = 0 -15n = -5 + -17n + 0 -15n = -5 + -17n Solving -15n = -5 + -17n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '17n' to each side of the equation. -15n + 17n = -5 + -17n + 17n Combine like terms: -15n + 17n = 2n 2n = -5 + -17n + 17n Combine like terms: -17n + 17n = 0 2n = -5 + 0 2n = -5 Divide each side by '2'. n = -2.5 Simplifying n = -2.5
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