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Simplifying r2 + 900 = r2 + 36r + 324 Reorder the terms: 900 + r2 = r2 + 36r + 324 Reorder the terms: 900 + r2 = 324 + 36r + r2 Add '-1r2' to each side of the equation. 900 + r2 + -1r2 = 324 + 36r + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 900 + 0 = 324 + 36r + r2 + -1r2 900 = 324 + 36r + r2 + -1r2 Combine like terms: r2 + -1r2 = 0 900 = 324 + 36r + 0 900 = 324 + 36r Solving 900 = 324 + 36r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-36r' to each side of the equation. 900 + -36r = 324 + 36r + -36r Combine like terms: 36r + -36r = 0 900 + -36r = 324 + 0 900 + -36r = 324 Add '-900' to each side of the equation. 900 + -900 + -36r = 324 + -900 Combine like terms: 900 + -900 = 0 0 + -36r = 324 + -900 -36r = 324 + -900 Combine like terms: 324 + -900 = -576 -36r = -576 Divide each side by '-36'. r = 16 Simplifying r = 16
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