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Simplifying 8 + 1(r + -9) = -2 Reorder the terms: 8 + 1(-9 + r) = -2 8 + (-9 * 1 + r * 1) = -2 8 + (-9 + 1r) = -2 Combine like terms: 8 + -9 = -1 -1 + 1r = -2 Solving -1 + 1r = -2 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 1r = -2 + 1 Combine like terms: -1 + 1 = 0 0 + 1r = -2 + 1 1r = -2 + 1 Combine like terms: -2 + 1 = -1 1r = -1 Divide each side by '1'. r = -1 Simplifying r = -1
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