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Simplifying (6r + -31) = 21 Reorder the terms: (-31 + 6r) = 21 Remove parenthesis around (-31 + 6r) -31 + 6r = 21 Solving -31 + 6r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + 6r = 21 + 31 Combine like terms: -31 + 31 = 0 0 + 6r = 21 + 31 6r = 21 + 31 Combine like terms: 21 + 31 = 52 6r = 52 Divide each side by '6'. r = 8.666666667 Simplifying r = 8.666666667
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