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Simplifying 21 + -3(2b + -3) = -12 Reorder the terms: 21 + -3(-3 + 2b) = -12 21 + (-3 * -3 + 2b * -3) = -12 21 + (9 + -6b) = -12 Combine like terms: 21 + 9 = 30 30 + -6b = -12 Solving 30 + -6b = -12 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -6b = -12 + -30 Combine like terms: 30 + -30 = 0 0 + -6b = -12 + -30 -6b = -12 + -30 Combine like terms: -12 + -30 = -42 -6b = -42 Divide each side by '-6'. b = 7 Simplifying b = 7
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