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Simplifying 5r + -15 = 3r + 21 Reorder the terms: -15 + 5r = 3r + 21 Reorder the terms: -15 + 5r = 21 + 3r Solving -15 + 5r = 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. -15 + 5r + -3r = 21 + 3r + -3r Combine like terms: 5r + -3r = 2r -15 + 2r = 21 + 3r + -3r Combine like terms: 3r + -3r = 0 -15 + 2r = 21 + 0 -15 + 2r = 21 Add '15' to each side of the equation. -15 + 15 + 2r = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 2r = 21 + 15 2r = 21 + 15 Combine like terms: 21 + 15 = 36 2r = 36 Divide each side by '2'. r = 18 Simplifying r = 18
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