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Simplifying 2r + -14 = 21 + 7r Reorder the terms: -14 + 2r = 21 + 7r Solving -14 + 2r = 21 + 7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7r' to each side of the equation. -14 + 2r + -7r = 21 + 7r + -7r Combine like terms: 2r + -7r = -5r -14 + -5r = 21 + 7r + -7r Combine like terms: 7r + -7r = 0 -14 + -5r = 21 + 0 -14 + -5r = 21 Add '14' to each side of the equation. -14 + 14 + -5r = 21 + 14 Combine like terms: -14 + 14 = 0 0 + -5r = 21 + 14 -5r = 21 + 14 Combine like terms: 21 + 14 = 35 -5r = 35 Divide each side by '-5'. r = -7 Simplifying r = -7
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