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Simplifying r + 6 + -2r = 15 Reorder the terms: 6 + r + -2r = 15 Combine like terms: r + -2r = -1r 6 + -1r = 15 Solving 6 + -1r = 15 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 + -1r = 15 + -6 Combine like terms: 6 + -6 = 0 0 + -1r = 15 + -6 -1r = 15 + -6 Combine like terms: 15 + -6 = 9 -1r = 9 Divide each side by '-1'. r = -9 Simplifying r = -9
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