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Simplifying 28 + -1r = 18 Solving 28 + -1r = 18 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -1r = 18 + -28 Combine like terms: 28 + -28 = 0 0 + -1r = 18 + -28 -1r = 18 + -28 Combine like terms: 18 + -28 = -10 -1r = -10 Divide each side by '-1'. r = 10 Simplifying r = 10
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