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Simplifying 9 + -7r + 1 + 4r = 0 Reorder the terms: 9 + 1 + -7r + 4r = 0 Combine like terms: 9 + 1 = 10 10 + -7r + 4r = 0 Combine like terms: -7r + 4r = -3r 10 + -3r = 0 Solving 10 + -3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + -3r = 0 + -10 Combine like terms: 10 + -10 = 0 0 + -3r = 0 + -10 -3r = 0 + -10 Combine like terms: 0 + -10 = -10 -3r = -10 Divide each side by '-3'. r = 3.333333333 Simplifying r = 3.333333333
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