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Simplifying 66 = r + 27 Reorder the terms: 66 = 27 + r Solving 66 = 27 + 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. 66 + -1r = 27 + r + -1r Combine like terms: r + -1r = 0 66 + -1r = 27 + 0 66 + -1r = 27 Add '-66' to each side of the equation. 66 + -66 + -1r = 27 + -66 Combine like terms: 66 + -66 = 0 0 + -1r = 27 + -66 -1r = 27 + -66 Combine like terms: 27 + -66 = -39 -1r = -39 Divide each side by '-1'. r = 39 Simplifying r = 39
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