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