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Simplifying -21 = -4b + -1 Reorder the terms: -21 = -1 + -4b Solving -21 = -1 + -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. -21 + 4b = -1 + -4b + 4b Combine like terms: -4b + 4b = 0 -21 + 4b = -1 + 0 -21 + 4b = -1 Add '21' to each side of the equation. -21 + 21 + 4b = -1 + 21 Combine like terms: -21 + 21 = 0 0 + 4b = -1 + 21 4b = -1 + 21 Combine like terms: -1 + 21 = 20 4b = 20 Divide each side by '4'. b = 5 Simplifying b = 5
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