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Simplifying -13r = r + -1(-4) Multiply -1 * -4 -13r = r + 4 Reorder the terms: -13r = 4 + r Solving -13r = 4 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -13r + -1r = 4 + r + -1r Combine like terms: -13r + -1r = -14r -14r = 4 + r + -1r Combine like terms: r + -1r = 0 -14r = 4 + 0 -14r = 4 Divide each side by '-14'. r = -0.2857142857 Simplifying r = -0.2857142857
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