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Simplifying x2 + 2r + y2 = 55 + 10y Reorder the terms: 2r + x2 + y2 = 55 + 10y Solving 2r + x2 + y2 = 55 + 10y Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1x2' to each side of the equation. 2r + x2 + -1x2 + y2 = 55 + -1x2 + 10y Combine like terms: x2 + -1x2 = 0 2r + 0 + y2 = 55 + -1x2 + 10y 2r + y2 = 55 + -1x2 + 10y Add '-1y2' to each side of the equation. 2r + y2 + -1y2 = 55 + -1x2 + 10y + -1y2 Combine like terms: y2 + -1y2 = 0 2r + 0 = 55 + -1x2 + 10y + -1y2 2r = 55 + -1x2 + 10y + -1y2 Divide each side by '2'. r = 27.5 + -0.5x2 + 5y + -0.5y2 Simplifying r = 27.5 + -0.5x2 + 5y + -0.5y2
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