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Simplifying 25 = r + 7 Reorder the terms: 25 = 7 + r Solving 25 = 7 + 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. 25 + -1r = 7 + r + -1r Combine like terms: r + -1r = 0 25 + -1r = 7 + 0 25 + -1r = 7 Add '-25' to each side of the equation. 25 + -25 + -1r = 7 + -25 Combine like terms: 25 + -25 = 0 0 + -1r = 7 + -25 -1r = 7 + -25 Combine like terms: 7 + -25 = -18 -1r = -18 Divide each side by '-1'. r = 18 Simplifying r = 18
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