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Simplifying x2 + 0.8x + c = y Reorder the terms: c + 0.8x + x2 = y Solving c + 0.8x + x2 = y Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.8x' to each side of the equation. c + 0.8x + -0.8x + x2 = -0.8x + y Combine like terms: 0.8x + -0.8x = 0.0 c + 0.0 + x2 = -0.8x + y c + x2 = -0.8x + y Add '-1x2' to each side of the equation. c + x2 + -1x2 = -0.8x + -1x2 + y Combine like terms: x2 + -1x2 = 0 c + 0 = -0.8x + -1x2 + y c = -0.8x + -1x2 + y Simplifying c = -0.8x + -1x2 + y
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