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Simplifying 13 + 8 = rt Combine like terms: 13 + 8 = 21 21 = rt Solving 21 = rt Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1rt' to each side of the equation. 21 + -1rt = rt + -1rt Combine like terms: rt + -1rt = 0 21 + -1rt = 0 Add '-21' to each side of the equation. 21 + -21 + -1rt = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -1rt = 0 + -21 -1rt = 0 + -21 Combine like terms: 0 + -21 = -21 -1rt = -21 Divide each side by '-1t'. r = 21t-1 Simplifying r = 21t-1
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