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Simplifying -3(r + 1) + -1r = 9 Reorder the terms: -3(1 + r) + -1r = 9 (1 * -3 + r * -3) + -1r = 9 (-3 + -3r) + -1r = 9 Combine like terms: -3r + -1r = -4r -3 + -4r = 9 Solving -3 + -4r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -4r = 9 + 3 Combine like terms: -3 + 3 = 0 0 + -4r = 9 + 3 -4r = 9 + 3 Combine like terms: 9 + 3 = 12 -4r = 12 Divide each side by '-4'. r = -3 Simplifying r = -3
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