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Simplifying -8 = -1(r + 4) Reorder the terms: -8 = -1(4 + r) -8 = (4 * -1 + r * -1) -8 = (-4 + -1r) Solving -8 = -4 + -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. -8 + r = -4 + -1r + r Combine like terms: -1r + r = 0 -8 + r = -4 + 0 -8 + r = -4 Add '8' to each side of the equation. -8 + 8 + r = -4 + 8 Combine like terms: -8 + 8 = 0 0 + r = -4 + 8 r = -4 + 8 Combine like terms: -4 + 8 = 4 r = 4 Simplifying r = 4
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