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Simplifying 2(7b + -4) = b + -21 Reorder the terms: 2(-4 + 7b) = b + -21 (-4 * 2 + 7b * 2) = b + -21 (-8 + 14b) = b + -21 Reorder the terms: -8 + 14b = -21 + b Solving -8 + 14b = -21 + 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. -8 + 14b + -1b = -21 + b + -1b Combine like terms: 14b + -1b = 13b -8 + 13b = -21 + b + -1b Combine like terms: b + -1b = 0 -8 + 13b = -21 + 0 -8 + 13b = -21 Add '8' to each side of the equation. -8 + 8 + 13b = -21 + 8 Combine like terms: -8 + 8 = 0 0 + 13b = -21 + 8 13b = -21 + 8 Combine like terms: -21 + 8 = -13 13b = -13 Divide each side by '13'. b = -1 Simplifying b = -1
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