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Simplifying -13 = r + -1 + -5r Reorder the terms: -13 = -1 + r + -5r Combine like terms: r + -5r = -4r -13 = -1 + -4r Solving -13 = -1 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -13 + 4r = -1 + -4r + 4r Combine like terms: -4r + 4r = 0 -13 + 4r = -1 + 0 -13 + 4r = -1 Add '13' to each side of the equation. -13 + 13 + 4r = -1 + 13 Combine like terms: -13 + 13 = 0 0 + 4r = -1 + 13 4r = -1 + 13 Combine like terms: -1 + 13 = 12 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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