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Simplifying 12r + 2r + -6r + -3 = 13 Reorder the terms: -3 + 12r + 2r + -6r = 13 Combine like terms: 12r + 2r = 14r -3 + 14r + -6r = 13 Combine like terms: 14r + -6r = 8r -3 + 8r = 13 Solving -3 + 8r = 13 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 + 8r = 13 + 3 Combine like terms: -3 + 3 = 0 0 + 8r = 13 + 3 8r = 13 + 3 Combine like terms: 13 + 3 = 16 8r = 16 Divide each side by '8'. r = 2 Simplifying r = 2
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