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Simplifying ax + -3a + 7x + -21 = 0 Reorder the terms: -21 + -3a + ax + 7x = 0 Solving -21 + -3a + ax + 7x = 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 + -3a + ax + 21 + 7x = 0 + 21 Reorder the terms: -21 + 21 + -3a + ax + 7x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -3a + ax + 7x = 0 + 21 -3a + ax + 7x = 0 + 21 Combine like terms: 0 + 21 = 21 -3a + ax + 7x = 21 Add '-7x' to each side of the equation. -3a + ax + 7x + -7x = 21 + -7x Combine like terms: 7x + -7x = 0 -3a + ax + 0 = 21 + -7x -3a + ax = 21 + -7x Reorder the terms: -21 + -3a + ax + 7x = 21 + -7x + -21 + 7x Reorder the terms: -21 + -3a + ax + 7x = 21 + -21 + -7x + 7x Combine like terms: 21 + -21 = 0 -21 + -3a + ax + 7x = 0 + -7x + 7x -21 + -3a + ax + 7x = -7x + 7x Combine like terms: -7x + 7x = 0 -21 + -3a + ax + 7x = 0 The solution to this equation could not be determined.
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