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Simplifying 2x2 + 9r + 7 = 0 Reorder the terms: 7 + 9r + 2x2 = 0 Solving 7 + 9r + 2x2 = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + 9r + -7 + 2x2 = 0 + -7 Reorder the terms: 7 + -7 + 9r + 2x2 = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 9r + 2x2 = 0 + -7 9r + 2x2 = 0 + -7 Combine like terms: 0 + -7 = -7 9r + 2x2 = -7 Add '-2x2' to each side of the equation. 9r + 2x2 + -2x2 = -7 + -2x2 Combine like terms: 2x2 + -2x2 = 0 9r + 0 = -7 + -2x2 9r = -7 + -2x2 Divide each side by '9'. r = -0.7777777778 + -0.2222222222x2 Simplifying r = -0.7777777778 + -0.2222222222x2
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