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Simplifying 5 + -1r = 21 Solving 5 + -1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1r = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -1r = 21 + -5 -1r = 21 + -5 Combine like terms: 21 + -5 = 16 -1r = 16 Divide each side by '-1'. r = -16 Simplifying r = -16
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