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Simplifying -21 + -2b = 3(2b + -1) Reorder the terms: -21 + -2b = 3(-1 + 2b) -21 + -2b = (-1 * 3 + 2b * 3) -21 + -2b = (-3 + 6b) Solving -21 + -2b = -3 + 6b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-6b' to each side of the equation. -21 + -2b + -6b = -3 + 6b + -6b Combine like terms: -2b + -6b = -8b -21 + -8b = -3 + 6b + -6b Combine like terms: 6b + -6b = 0 -21 + -8b = -3 + 0 -21 + -8b = -3 Add '21' to each side of the equation. -21 + 21 + -8b = -3 + 21 Combine like terms: -21 + 21 = 0 0 + -8b = -3 + 21 -8b = -3 + 21 Combine like terms: -3 + 21 = 18 -8b = 18 Divide each side by '-8'. b = -2.25 Simplifying b = -2.25
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