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Simplifying 13 + -1(-4r) = -13 Remove parenthesis around (-4r) 13 + -1 * -4r = -13 Multiply -1 * -4 13 + 4r = -13 Solving 13 + 4r = -13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 4r = -13 + -13 Combine like terms: 13 + -13 = 0 0 + 4r = -13 + -13 4r = -13 + -13 Combine like terms: -13 + -13 = -26 4r = -26 Divide each side by '4'. r = -6.5 Simplifying r = -6.5
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