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Simplifying 9ab + -3a + -21b + 7 = 0 Reorder the terms: 7 + -3a + 9ab + -21b = 0 Solving 7 + -3a + 9ab + -21b = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -3a + 9ab + -7 + -21b = 0 + -7 Reorder the terms: 7 + -7 + -3a + 9ab + -21b = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -3a + 9ab + -21b = 0 + -7 -3a + 9ab + -21b = 0 + -7 Combine like terms: 0 + -7 = -7 -3a + 9ab + -21b = -7 Add '21b' to each side of the equation. -3a + 9ab + -21b + 21b = -7 + 21b Combine like terms: -21b + 21b = 0 -3a + 9ab + 0 = -7 + 21b -3a + 9ab = -7 + 21b Reorder the terms: 7 + -3a + 9ab + -21b = -7 + 21b + 7 + -21b Reorder the terms: 7 + -3a + 9ab + -21b = -7 + 7 + 21b + -21b Combine like terms: -7 + 7 = 0 7 + -3a + 9ab + -21b = 0 + 21b + -21b 7 + -3a + 9ab + -21b = 21b + -21b Combine like terms: 21b + -21b = 0 7 + -3a + 9ab + -21b = 0 The solution to this equation could not be determined.
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