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Simplifying -21 = 3(b + -4) Reorder the terms: -21 = 3(-4 + b) -21 = (-4 * 3 + b * 3) -21 = (-12 + 3b) Solving -21 = -12 + 3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3b' to each side of the equation. -21 + -3b = -12 + 3b + -3b Combine like terms: 3b + -3b = 0 -21 + -3b = -12 + 0 -21 + -3b = -12 Add '21' to each side of the equation. -21 + 21 + -3b = -12 + 21 Combine like terms: -21 + 21 = 0 0 + -3b = -12 + 21 -3b = -12 + 21 Combine like terms: -12 + 21 = 9 -3b = 9 Divide each side by '-3'. b = -3 Simplifying b = -3
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