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Simplifying -9 + 3r = -1(1 + r) -9 + 3r = (1 * -1 + r * -1) -9 + 3r = (-1 + -1r) Solving -9 + 3r = -1 + -1r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add 'r' to each side of the equation. -9 + 3r + r = -1 + -1r + r Combine like terms: 3r + r = 4r -9 + 4r = -1 + -1r + r Combine like terms: -1r + r = 0 -9 + 4r = -1 + 0 -9 + 4r = -1 Add '9' to each side of the equation. -9 + 9 + 4r = -1 + 9 Combine like terms: -9 + 9 = 0 0 + 4r = -1 + 9 4r = -1 + 9 Combine like terms: -1 + 9 = 8 4r = 8 Divide each side by '4'. r = 2 Simplifying r = 2
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