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Simplifying 4 + 0.8b = 0.9b Solving 4 + 0.8b = 0.9b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-0.9b' to each side of the equation. 4 + 0.8b + -0.9b = 0.9b + -0.9b Combine like terms: 0.8b + -0.9b = -0.1b 4 + -0.1b = 0.9b + -0.9b Combine like terms: 0.9b + -0.9b = 0.0 4 + -0.1b = 0.0 Add '-4' to each side of the equation. 4 + -4 + -0.1b = 0.0 + -4 Combine like terms: 4 + -4 = 0 0 + -0.1b = 0.0 + -4 -0.1b = 0.0 + -4 Combine like terms: 0.0 + -4 = -4 -0.1b = -4 Divide each side by '-0.1'. b = 40 Simplifying b = 40
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