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Simplifying 9x2 + 3r + -30 = 0 Reorder the terms: -30 + 3r + 9x2 = 0 Solving -30 + 3r + 9x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 3r + 30 + 9x2 = 0 + 30 Reorder the terms: -30 + 30 + 3r + 9x2 = 0 + 30 Combine like terms: -30 + 30 = 0 0 + 3r + 9x2 = 0 + 30 3r + 9x2 = 0 + 30 Combine like terms: 0 + 30 = 30 3r + 9x2 = 30 Add '-9x2' to each side of the equation. 3r + 9x2 + -9x2 = 30 + -9x2 Combine like terms: 9x2 + -9x2 = 0 3r + 0 = 30 + -9x2 3r = 30 + -9x2 Divide each side by '3'. r = 10 + -3x2 Simplifying r = 10 + -3x2
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