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Simplifying 20.9 = 2.5 + 2.3(m + -1) Reorder the terms: 20.9 = 2.5 + 2.3(-1 + m) 20.9 = 2.5 + (-1 * 2.3 + m * 2.3) 20.9 = 2.5 + (-2.3 + 2.3m) Combine like terms: 2.5 + -2.3 = 0.2 20.9 = 0.2 + 2.3m Solving 20.9 = 0.2 + 2.3m Solving for variable 'm'. Move all terms containing m to the left, all other terms to the right. Add '-2.3m' to each side of the equation. 20.9 + -2.3m = 0.2 + 2.3m + -2.3m Combine like terms: 2.3m + -2.3m = 0.0 20.9 + -2.3m = 0.2 + 0.0 20.9 + -2.3m = 0.2 Add '-20.9' to each side of the equation. 20.9 + -20.9 + -2.3m = 0.2 + -20.9 Combine like terms: 20.9 + -20.9 = 0.0 0.0 + -2.3m = 0.2 + -20.9 -2.3m = 0.2 + -20.9 Combine like terms: 0.2 + -20.9 = -20.7 -2.3m = -20.7 Divide each side by '-2.3'. m = 9 Simplifying m = 9
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