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Simplifying 390 = 15n + 75 Reorder the terms: 390 = 75 + 15n Solving 390 = 75 + 15n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-15n' to each side of the equation. 390 + -15n = 75 + 15n + -15n Combine like terms: 15n + -15n = 0 390 + -15n = 75 + 0 390 + -15n = 75 Add '-390' to each side of the equation. 390 + -390 + -15n = 75 + -390 Combine like terms: 390 + -390 = 0 0 + -15n = 75 + -390 -15n = 75 + -390 Combine like terms: 75 + -390 = -315 -15n = -315 Divide each side by '-15'. n = 21 Simplifying n = 21
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