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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 = 4b -21 + 4b = 3 + -6b + 6b Combine like terms: -6b + 6b = 0 -21 + 4b = 3 + 0 -21 + 4b = 3 Add '21' to each side of the equation. -21 + 21 + 4b = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 4b = 3 + 21 4b = 3 + 21 Combine like terms: 3 + 21 = 24 4b = 24 Divide each side by '4'. b = 6 Simplifying b = 6
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