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Simplifying 3b + -7(3 + b) = b + 3 3b + (3 * -7 + b * -7) = b + 3 3b + (-21 + -7b) = b + 3 Reorder the terms: -21 + 3b + -7b = b + 3 Combine like terms: 3b + -7b = -4b -21 + -4b = b + 3 Reorder the terms: -21 + -4b = 3 + b Solving -21 + -4b = 3 + b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-1b' to each side of the equation. -21 + -4b + -1b = 3 + b + -1b Combine like terms: -4b + -1b = -5b -21 + -5b = 3 + b + -1b Combine like terms: b + -1b = 0 -21 + -5b = 3 + 0 -21 + -5b = 3 Add '21' to each side of the equation. -21 + 21 + -5b = 3 + 21 Combine like terms: -21 + 21 = 0 0 + -5b = 3 + 21 -5b = 3 + 21 Combine like terms: 3 + 21 = 24 -5b = 24 Divide each side by '-5'. b = -4.8 Simplifying b = -4.8
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