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Simplifying 5x2 + -7x + r = 0 Reorder the terms: r + -7x + 5x2 = 0 Solving r + -7x + 5x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7x' to each side of the equation. r + -7x + 7x + 5x2 = 0 + 7x Combine like terms: -7x + 7x = 0 r + 0 + 5x2 = 0 + 7x r + 5x2 = 0 + 7x Remove the zero: r + 5x2 = 7x Add '-5x2' to each side of the equation. r + 5x2 + -5x2 = 7x + -5x2 Combine like terms: 5x2 + -5x2 = 0 r + 0 = 7x + -5x2 r = 7x + -5x2 Simplifying r = 7x + -5x2
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