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Simplifying -3 + -9(-1r + 7) = 0 Reorder the terms: -3 + -9(7 + -1r) = 0 -3 + (7 * -9 + -1r * -9) = 0 -3 + (-63 + 9r) = 0 Combine like terms: -3 + -63 = -66 -66 + 9r = 0 Solving -66 + 9r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '66' to each side of the equation. -66 + 66 + 9r = 0 + 66 Combine like terms: -66 + 66 = 0 0 + 9r = 0 + 66 9r = 0 + 66 Combine like terms: 0 + 66 = 66 9r = 66 Divide each side by '9'. r = 7.333333333 Simplifying r = 7.333333333
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