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Simplifying 15 = 4.3 + -2.1(n + -3) Reorder the terms: 15 = 4.3 + -2.1(-3 + n) 15 = 4.3 + (-3 * -2.1 + n * -2.1) 15 = 4.3 + (6.3 + -2.1n) Combine like terms: 4.3 + 6.3 = 10.6 15 = 10.6 + -2.1n Solving 15 = 10.6 + -2.1n Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2.1n' to each side of the equation. 15 + 2.1n = 10.6 + -2.1n + 2.1n Combine like terms: -2.1n + 2.1n = 0.0 15 + 2.1n = 10.6 + 0.0 15 + 2.1n = 10.6 Add '-15' to each side of the equation. 15 + -15 + 2.1n = 10.6 + -15 Combine like terms: 15 + -15 = 0 0 + 2.1n = 10.6 + -15 2.1n = 10.6 + -15 Combine like terms: 10.6 + -15 = -4.4 2.1n = -4.4 Divide each side by '2.1'. n = -2.095238095 Simplifying n = -2.095238095
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