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Simplifying ab + 3b + -7a + -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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