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Simplifying ab + 7a + 3b + 21 = 0 Reorder the terms: 21 + 7a + ab + 3b = 0 Solving 21 + 7a + ab + 3b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 7a + ab + -21 + 3b = 0 + -21 Reorder the terms: 21 + -21 + 7a + ab + 3b = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7a + ab + 3b = 0 + -21 7a + ab + 3b = 0 + -21 Combine like terms: 0 + -21 = -21 7a + ab + 3b = -21 Add '-3b' to each side of the equation. 7a + ab + 3b + -3b = -21 + -3b Combine like terms: 3b + -3b = 0 7a + ab + 0 = -21 + -3b 7a + ab = -21 + -3b Reorder the terms: 21 + 7a + ab + 3b = -21 + -3b + 21 + 3b Reorder the terms: 21 + 7a + ab + 3b = -21 + 21 + -3b + 3b Combine like terms: -21 + 21 = 0 21 + 7a + ab + 3b = 0 + -3b + 3b 21 + 7a + ab + 3b = -3b + 3b Combine like terms: -3b + 3b = 0 21 + 7a + ab + 3b = 0 The solution to this equation could not be determined.
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