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Simplifying -7r + -4 + -9 + r + 15 = 0 Reorder the terms: -4 + -9 + 15 + -7r + r = 0 Combine like terms: -4 + -9 = -13 -13 + 15 + -7r + r = 0 Combine like terms: -13 + 15 = 2 2 + -7r + r = 0 Combine like terms: -7r + r = -6r 2 + -6r = 0 Solving 2 + -6r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -6r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -6r = 0 + -2 -6r = 0 + -2 Combine like terms: 0 + -2 = -2 -6r = -2 Divide each side by '-6'. r = 0.3333333333 Simplifying r = 0.3333333333
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