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Simplifying 18 + -1(9r + 7) = -16 Reorder the terms: 18 + -1(7 + 9r) = -16 18 + (7 * -1 + 9r * -1) = -16 18 + (-7 + -9r) = -16 Combine like terms: 18 + -7 = 11 11 + -9r = -16 Solving 11 + -9r = -16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -9r = -16 + -11 Combine like terms: 11 + -11 = 0 0 + -9r = -16 + -11 -9r = -16 + -11 Combine like terms: -16 + -11 = -27 -9r = -27 Divide each side by '-9'. r = 3 Simplifying r = 3
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