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Simplifying 3n + -9 = 7n + -15 Reorder the terms: -9 + 3n = 7n + -15 Reorder the terms: -9 + 3n = -15 + 7n Solving -9 + 3n = -15 + 7n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-7n' to each side of the equation. -9 + 3n + -7n = -15 + 7n + -7n Combine like terms: 3n + -7n = -4n -9 + -4n = -15 + 7n + -7n Combine like terms: 7n + -7n = 0 -9 + -4n = -15 + 0 -9 + -4n = -15 Add '9' to each side of the equation. -9 + 9 + -4n = -15 + 9 Combine like terms: -9 + 9 = 0 0 + -4n = -15 + 9 -4n = -15 + 9 Combine like terms: -15 + 9 = -6 -4n = -6 Divide each side by '-4'. n = 1.5 Simplifying n = 1.5
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