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Simplifying 2r + -21 = -14 + r Reorder the terms: -21 + 2r = -14 + r Solving -21 + 2r = -14 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -21 + 2r + -1r = -14 + r + -1r Combine like terms: 2r + -1r = 1r -21 + 1r = -14 + r + -1r Combine like terms: r + -1r = 0 -21 + 1r = -14 + 0 -21 + 1r = -14 Add '21' to each side of the equation. -21 + 21 + 1r = -14 + 21 Combine like terms: -21 + 21 = 0 0 + 1r = -14 + 21 1r = -14 + 21 Combine like terms: -14 + 21 = 7 1r = 7 Divide each side by '1'. r = 7 Simplifying r = 7
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