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Simplifying 7(b + 2) + -21 = 42 Reorder the terms: 7(2 + b) + -21 = 42 (2 * 7 + b * 7) + -21 = 42 (14 + 7b) + -21 = 42 Reorder the terms: 14 + -21 + 7b = 42 Combine like terms: 14 + -21 = -7 -7 + 7b = 42 Solving -7 + 7b = 42 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 7b = 42 + 7 Combine like terms: -7 + 7 = 0 0 + 7b = 42 + 7 7b = 42 + 7 Combine like terms: 42 + 7 = 49 7b = 49 Divide each side by '7'. b = 7 Simplifying b = 7
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