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Simplifying 66 = 9r + -6 Reorder the terms: 66 = -6 + 9r Solving 66 = -6 + 9r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-9r' to each side of the equation. 66 + -9r = -6 + 9r + -9r Combine like terms: 9r + -9r = 0 66 + -9r = -6 + 0 66 + -9r = -6 Add '-66' to each side of the equation. 66 + -66 + -9r = -6 + -66 Combine like terms: 66 + -66 = 0 0 + -9r = -6 + -66 -9r = -6 + -66 Combine like terms: -6 + -66 = -72 -9r = -72 Divide each side by '-9'. r = 8 Simplifying r = 8
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