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Simplifying 1r + -7 + 2r + 9 = 0 Reorder the terms: -7 + 9 + 1r + 2r = 0 Combine like terms: -7 + 9 = 2 2 + 1r + 2r = 0 Combine like terms: 1r + 2r = 3r 2 + 3r = 0 Solving 2 + 3r = 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 + 3r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + 3r = 0 + -2 3r = 0 + -2 Combine like terms: 0 + -2 = -2 3r = -2 Divide each side by '3'. r = -0.6666666667 Simplifying r = -0.6666666667
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