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Simplifying 7x + -8r + 13x + 9r = 0 Reorder the terms: -8r + 9r + 7x + 13x = 0 Combine like terms: -8r + 9r = 1r 1r + 7x + 13x = 0 Combine like terms: 7x + 13x = 20x 1r + 20x = 0 Solving 1r + 20x = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20x' to each side of the equation. 1r + 20x + -20x = 0 + -20x Combine like terms: 20x + -20x = 0 1r + 0 = 0 + -20x 1r = 0 + -20x Remove the zero: 1r = -20x Divide each side by '1'. r = -20x Simplifying r = -20x
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