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Simplifying x2 + y2 + -7a + c = 0 Reorder the terms: -7a + c + x2 + y2 = 0 Solving -7a + c + x2 + y2 = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1c' to each side of the equation. -7a + c + x2 + -1c + y2 = 0 + -1c Reorder the terms: -7a + c + -1c + x2 + y2 = 0 + -1c Combine like terms: c + -1c = 0 -7a + 0 + x2 + y2 = 0 + -1c -7a + x2 + y2 = 0 + -1c Remove the zero: -7a + x2 + y2 = -1c Add '-1x2' to each side of the equation. -7a + x2 + -1x2 + y2 = -1c + -1x2 Combine like terms: x2 + -1x2 = 0 -7a + 0 + y2 = -1c + -1x2 -7a + y2 = -1c + -1x2 Add '-1y2' to each side of the equation. -7a + y2 + -1y2 = -1c + -1x2 + -1y2 Combine like terms: y2 + -1y2 = 0 -7a + 0 = -1c + -1x2 + -1y2 -7a = -1c + -1x2 + -1y2 Divide each side by '-7'. a = 0.1428571429c + 0.1428571429x2 + 0.1428571429y2 Simplifying a = 0.1428571429c + 0.1428571429x2 + 0.1428571429y2
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