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Simplifying -4 = 3r + 21 Reorder the terms: -4 = 21 + 3r Solving -4 = 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. -4 + -3r = 21 + 3r + -3r Combine like terms: 3r + -3r = 0 -4 + -3r = 21 + 0 -4 + -3r = 21 Add '4' to each side of the equation. -4 + 4 + -3r = 21 + 4 Combine like terms: -4 + 4 = 0 0 + -3r = 21 + 4 -3r = 21 + 4 Combine like terms: 21 + 4 = 25 -3r = 25 Divide each side by '-3'. r = -8.333333333 Simplifying r = -8.333333333
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