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Simplifying 3r + -7r + 7 + r = 0 Reorder the terms: 7 + 3r + -7r + r = 0 Combine like terms: 3r + -7r = -4r 7 + -4r + r = 0 Combine like terms: -4r + r = -3r 7 + -3r = 0 Solving 7 + -3r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -3r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -3r = 0 + -7 -3r = 0 + -7 Combine like terms: 0 + -7 = -7 -3r = -7 Divide each side by '-3'. r = 2.333333333 Simplifying r = 2.333333333
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