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Simplifying 3r + 9 = 7 Reorder the terms: 9 + 3r = 7 Solving 9 + 3r = 7 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 3r = 7 + -9 Combine like terms: 9 + -9 = 0 0 + 3r = 7 + -9 3r = 7 + -9 Combine like terms: 7 + -9 = -2 3r = -2 Divide each side by '3'. r = -0.6666666667 Simplifying r = -0.6666666667
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