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Simplifying 3b + -12 = 21b Reorder the terms: -12 + 3b = 21b Solving -12 + 3b = 21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21b' to each side of the equation. -12 + 3b + -21b = 21b + -21b Combine like terms: 3b + -21b = -18b -12 + -18b = 21b + -21b Combine like terms: 21b + -21b = 0 -12 + -18b = 0 Add '12' to each side of the equation. -12 + 12 + -18b = 0 + 12 Combine like terms: -12 + 12 = 0 0 + -18b = 0 + 12 -18b = 0 + 12 Combine like terms: 0 + 12 = 12 -18b = 12 Divide each side by '-18'. b = -0.6666666667 Simplifying b = -0.6666666667
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