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Simplifying -21 + -9b = -6b + -3 Reorder the terms: -21 + -9b = -3 + -6b Solving -21 + -9b = -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 + -9b + 6b = -3 + -6b + 6b Combine like terms: -9b + 6b = -3b -21 + -3b = -3 + -6b + 6b Combine like terms: -6b + 6b = 0 -21 + -3b = -3 + 0 -21 + -3b = -3 Add '21' to each side of the equation. -21 + 21 + -3b = -3 + 21 Combine like terms: -21 + 21 = 0 0 + -3b = -3 + 21 -3b = -3 + 21 Combine like terms: -3 + 21 = 18 -3b = 18 Divide each side by '-3'. b = -6 Simplifying b = -6
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