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Simplifying r + -3 + -3r = 9 Reorder the terms: -3 + r + -3r = 9 Combine like terms: r + -3r = -2r -3 + -2r = 9 Solving -3 + -2r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -2r = 9 + 3 Combine like terms: -3 + 3 = 0 0 + -2r = 9 + 3 -2r = 9 + 3 Combine like terms: 9 + 3 = 12 -2r = 12 Divide each side by '-2'. r = -6 Simplifying r = -6
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