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Simplifying 2r + -9(9r + 7) = 0 Reorder the terms: 2r + -9(7 + 9r) = 0 2r + (7 * -9 + 9r * -9) = 0 2r + (-63 + -81r) = 0 Reorder the terms: -63 + 2r + -81r = 0 Combine like terms: 2r + -81r = -79r -63 + -79r = 0 Solving -63 + -79r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + -79r = 0 + 63 Combine like terms: -63 + 63 = 0 0 + -79r = 0 + 63 -79r = 0 + 63 Combine like terms: 0 + 63 = 63 -79r = 63 Divide each side by '-79'. r = -0.7974683544 Simplifying r = -0.7974683544
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