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Simplifying -21 = 3b Solving -21 = 3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3b' to each side of the equation. -21 + -3b = 3b + -3b Combine like terms: 3b + -3b = 0 -21 + -3b = 0 Add '21' to each side of the equation. -21 + 21 + -3b = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -3b = 0 + 21 -3b = 0 + 21 Combine like terms: 0 + 21 = 21 -3b = 21 Divide each side by '-3'. b = -7 Simplifying b = -7
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