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Simplifying 21 = 3r Solving 21 = 3r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3r' to each side of the equation. 21 + -3r = 3r + -3r Combine like terms: 3r + -3r = 0 21 + -3r = 0 Add '-21' to each side of the equation. 21 + -21 + -3r = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3r = 0 + -21 -3r = 0 + -21 Combine like terms: 0 + -21 = -21 -3r = -21 Divide each side by '-3'. r = 7 Simplifying r = 7
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