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Simplifying (9r + -1s) + (4r + -1s) = 0 Remove parenthesis around (9r + -1s) 9r + -1s + (4r + -1s) = 0 Remove parenthesis around (4r + -1s) 9r + -1s + 4r + -1s = 0 Reorder the terms: 9r + 4r + -1s + -1s = 0 Combine like terms: 9r + 4r = 13r 13r + -1s + -1s = 0 Combine like terms: -1s + -1s = -2s 13r + -2s = 0 Solving 13r + -2s = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2s' to each side of the equation. 13r + -2s + 2s = 0 + 2s Combine like terms: -2s + 2s = 0 13r + 0 = 0 + 2s 13r = 0 + 2s Remove the zero: 13r = 2s Divide each side by '13'. r = 0.1538461538s Simplifying r = 0.1538461538s
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