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