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Simplifying 9x2 + 7r + -56 = 0 Reorder the terms: -56 + 7r + 9x2 = 0 Solving -56 + 7r + 9x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '56' to each side of the equation. -56 + 7r + 56 + 9x2 = 0 + 56 Reorder the terms: -56 + 56 + 7r + 9x2 = 0 + 56 Combine like terms: -56 + 56 = 0 0 + 7r + 9x2 = 0 + 56 7r + 9x2 = 0 + 56 Combine like terms: 0 + 56 = 56 7r + 9x2 = 56 Add '-9x2' to each side of the equation. 7r + 9x2 + -9x2 = 56 + -9x2 Combine like terms: 9x2 + -9x2 = 0 7r + 0 = 56 + -9x2 7r = 56 + -9x2 Divide each side by '7'. r = 8 + -1.285714286x2 Simplifying r = 8 + -1.285714286x2
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