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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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