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Simplifying 21 + -1r = -8 Solving 21 + -1r = -8 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + -1r = -8 + -21 Combine like terms: 21 + -21 = 0 0 + -1r = -8 + -21 -1r = -8 + -21 Combine like terms: -8 + -21 = -29 -1r = -29 Divide each side by '-1'. r = 29 Simplifying r = 29
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