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Simplifying -21b + -76 = -643 Reorder the terms: -76 + -21b = -643 Solving -76 + -21b = -643 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '76' to each side of the equation. -76 + 76 + -21b = -643 + 76 Combine like terms: -76 + 76 = 0 0 + -21b = -643 + 76 -21b = -643 + 76 Combine like terms: -643 + 76 = -567 -21b = -567 Divide each side by '-21'. b = 27 Simplifying b = 27
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