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Simplifying -3(7 + 2b) + b = 2b + 7 (7 * -3 + 2b * -3) + b = 2b + 7 (-21 + -6b) + b = 2b + 7 Combine like terms: -6b + b = -5b -21 + -5b = 2b + 7 Reorder the terms: -21 + -5b = 7 + 2b Solving -21 + -5b = 7 + 2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-2b' to each side of the equation. -21 + -5b + -2b = 7 + 2b + -2b Combine like terms: -5b + -2b = -7b -21 + -7b = 7 + 2b + -2b Combine like terms: 2b + -2b = 0 -21 + -7b = 7 + 0 -21 + -7b = 7 Add '21' to each side of the equation. -21 + 21 + -7b = 7 + 21 Combine like terms: -21 + 21 = 0 0 + -7b = 7 + 21 -7b = 7 + 21 Combine like terms: 7 + 21 = 28 -7b = 28 Divide each side by '-7'. b = -4 Simplifying b = -4
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