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Simplifying -3(7 + 5n) + -5n = -39 + -2n (7 * -3 + 5n * -3) + -5n = -39 + -2n (-21 + -15n) + -5n = -39 + -2n Combine like terms: -15n + -5n = -20n -21 + -20n = -39 + -2n Solving -21 + -20n = -39 + -2n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2n' to each side of the equation. -21 + -20n + 2n = -39 + -2n + 2n Combine like terms: -20n + 2n = -18n -21 + -18n = -39 + -2n + 2n Combine like terms: -2n + 2n = 0 -21 + -18n = -39 + 0 -21 + -18n = -39 Add '21' to each side of the equation. -21 + 21 + -18n = -39 + 21 Combine like terms: -21 + 21 = 0 0 + -18n = -39 + 21 -18n = -39 + 21 Combine like terms: -39 + 21 = -18 -18n = -18 Divide each side by '-18'. n = 1 Simplifying n = 1
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