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Simplifying -2(7r + 7) = 25 + -1r Reorder the terms: -2(7 + 7r) = 25 + -1r (7 * -2 + 7r * -2) = 25 + -1r (-14 + -14r) = 25 + -1r Solving -14 + -14r = 25 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -14 + -14r + r = 25 + -1r + r Combine like terms: -14r + r = -13r -14 + -13r = 25 + -1r + r Combine like terms: -1r + r = 0 -14 + -13r = 25 + 0 -14 + -13r = 25 Add '14' to each side of the equation. -14 + 14 + -13r = 25 + 14 Combine like terms: -14 + 14 = 0 0 + -13r = 25 + 14 -13r = 25 + 14 Combine like terms: 25 + 14 = 39 -13r = 39 Divide each side by '-13'. r = -3 Simplifying r = -3
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