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Simplifying 9x2 + 30x + k = 0 Reorder the terms: k + 30x + 9x2 = 0 Solving k + 30x + 9x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-30x' to each side of the equation. k + 30x + -30x + 9x2 = 0 + -30x Combine like terms: 30x + -30x = 0 k + 0 + 9x2 = 0 + -30x k + 9x2 = 0 + -30x Remove the zero: k + 9x2 = -30x Add '-9x2' to each side of the equation. k + 9x2 + -9x2 = -30x + -9x2 Combine like terms: 9x2 + -9x2 = 0 k + 0 = -30x + -9x2 k = -30x + -9x2 Simplifying k = -30x + -9x2
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