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Simplifying 2ab + -1ba + 21b + 12ba = 0 Reorder the terms: 2ab + -1ab + 12ab + 21b = 0 Combine like terms: 2ab + -1ab = 1ab 1ab + 12ab + 21b = 0 Combine like terms: 1ab + 12ab = 13ab 13ab + 21b = 0 Solving 13ab + 21b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21b' to each side of the equation. 13ab + 21b + -21b = 0 + -21b Combine like terms: 21b + -21b = 0 13ab + 0 = 0 + -21b 13ab = 0 + -21b Remove the zero: 13ab = -21b Divide each side by '13b'. a = -1.615384615 Simplifying a = -1.615384615
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