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Simplifying ab + 7a + 4b + 28 = 0 Reorder the terms: 28 + 7a + ab + 4b = 0 Solving 28 + 7a + ab + 4b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + 7a + ab + -28 + 4b = 0 + -28 Reorder the terms: 28 + -28 + 7a + ab + 4b = 0 + -28 Combine like terms: 28 + -28 = 0 0 + 7a + ab + 4b = 0 + -28 7a + ab + 4b = 0 + -28 Combine like terms: 0 + -28 = -28 7a + ab + 4b = -28 Add '-4b' to each side of the equation. 7a + ab + 4b + -4b = -28 + -4b Combine like terms: 4b + -4b = 0 7a + ab + 0 = -28 + -4b 7a + ab = -28 + -4b Reorder the terms: 28 + 7a + ab + 4b = -28 + -4b + 28 + 4b Reorder the terms: 28 + 7a + ab + 4b = -28 + 28 + -4b + 4b Combine like terms: -28 + 28 = 0 28 + 7a + ab + 4b = 0 + -4b + 4b 28 + 7a + ab + 4b = -4b + 4b Combine like terms: -4b + 4b = 0 28 + 7a + ab + 4b = 0 The solution to this equation could not be determined.
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