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Simplifying -21 = 4.2b Solving -21 = 4.2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4.2b' to each side of the equation. -21 + -4.2b = 4.2b + -4.2b Combine like terms: 4.2b + -4.2b = 0.0 -21 + -4.2b = 0.0 Add '21' to each side of the equation. -21 + 21 + -4.2b = 0.0 + 21 Combine like terms: -21 + 21 = 0 0 + -4.2b = 0.0 + 21 -4.2b = 0.0 + 21 Combine like terms: 0.0 + 21 = 21 -4.2b = 21 Divide each side by '-4.2'. b = -5 Simplifying b = -5
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