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Simplifying 7 = -13 + 0.4b Solving 7 = -13 + 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. 7 + -0.4b = -13 + 0.4b + -0.4b Combine like terms: 0.4b + -0.4b = 0.0 7 + -0.4b = -13 + 0.0 7 + -0.4b = -13 Add '-7' to each side of the equation. 7 + -7 + -0.4b = -13 + -7 Combine like terms: 7 + -7 = 0 0 + -0.4b = -13 + -7 -0.4b = -13 + -7 Combine like terms: -13 + -7 = -20 -0.4b = -20 Divide each side by '-0.4'. b = 50 Simplifying b = 50
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