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Simplifying 8b + 4 = 4b + -21 Reorder the terms: 4 + 8b = 4b + -21 Reorder the terms: 4 + 8b = -21 + 4b Solving 4 + 8b = -21 + 4b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4b' to each side of the equation. 4 + 8b + -4b = -21 + 4b + -4b Combine like terms: 8b + -4b = 4b 4 + 4b = -21 + 4b + -4b Combine like terms: 4b + -4b = 0 4 + 4b = -21 + 0 4 + 4b = -21 Add '-4' to each side of the equation. 4 + -4 + 4b = -21 + -4 Combine like terms: 4 + -4 = 0 0 + 4b = -21 + -4 4b = -21 + -4 Combine like terms: -21 + -4 = -25 4b = -25 Divide each side by '4'. b = -6.25 Simplifying b = -6.25
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