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Simplifying 2.8 = 0.4(b + -2.5) Reorder the terms: 2.8 = 0.4(-2.5 + b) 2.8 = (-2.5 * 0.4 + b * 0.4) 2.8 = (-1 + 0.4b) Solving 2.8 = -1 + 0.4b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.4b' to each side of the equation. 2.8 + -0.4b = -1 + 0.4b + -0.4b Combine like terms: 0.4b + -0.4b = 0.0 2.8 + -0.4b = -1 + 0.0 2.8 + -0.4b = -1 Add '-2.8' to each side of the equation. 2.8 + -2.8 + -0.4b = -1 + -2.8 Combine like terms: 2.8 + -2.8 = 0.0 0.0 + -0.4b = -1 + -2.8 -0.4b = -1 + -2.8 Combine like terms: -1 + -2.8 = -3.8 -0.4b = -3.8 Divide each side by '-0.4'. b = 9.5 Simplifying b = 9.5
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