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Simplifying -7(5b + 2) = 21 Reorder the terms: -7(2 + 5b) = 21 (2 * -7 + 5b * -7) = 21 (-14 + -35b) = 21 Solving -14 + -35b = 21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + -35b = 21 + 14 Combine like terms: -14 + 14 = 0 0 + -35b = 21 + 14 -35b = 21 + 14 Combine like terms: 21 + 14 = 35 -35b = 35 Divide each side by '-35'. b = -1 Simplifying b = -1
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