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Simplifying 15 = 4.2n + -2.1(n + -4) Reorder the terms: 15 = 4.2n + -2.1(-4 + n) 15 = 4.2n + (-4 * -2.1 + n * -2.1) 15 = 4.2n + (8.4 + -2.1n) Reorder the terms: 15 = 8.4 + 4.2n + -2.1n Combine like terms: 4.2n + -2.1n = 2.1n 15 = 8.4 + 2.1n Solving 15 = 8.4 + 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 = 8.4 + 2.1n + -2.1n Combine like terms: 2.1n + -2.1n = 0.0 15 + -2.1n = 8.4 + 0.0 15 + -2.1n = 8.4 Add '-15' to each side of the equation. 15 + -15 + -2.1n = 8.4 + -15 Combine like terms: 15 + -15 = 0 0 + -2.1n = 8.4 + -15 -2.1n = 8.4 + -15 Combine like terms: 8.4 + -15 = -6.6 -2.1n = -6.6 Divide each side by '-2.1'. n = 3.142857143 Simplifying n = 3.142857143
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