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Simplifying 12r + 2r + 5r + -18r + -1 = 15 Reorder the terms: -1 + 12r + 2r + 5r + -18r = 15 Combine like terms: 12r + 2r = 14r -1 + 14r + 5r + -18r = 15 Combine like terms: 14r + 5r = 19r -1 + 19r + -18r = 15 Combine like terms: 19r + -18r = 1r -1 + 1r = 15 Solving -1 + 1r = 15 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1r = 15 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = 15 + 1 1r = 15 + 1 Combine like terms: 15 + 1 = 16 1r = 16 Divide each side by '1'. r = 16 Simplifying r = 16
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