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Simplifying 15 + -1r = 6 Solving 15 + -1r = 6 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1r = 6 + -15 Combine like terms: 15 + -15 = 0 0 + -1r = 6 + -15 -1r = 6 + -15 Combine like terms: 6 + -15 = -9 -1r = -9 Divide each side by '-1'. r = 9 Simplifying r = 9
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