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Simplifying 13 + -1r = -4 Solving 13 + -1r = -4 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 + -1r = -4 + -13 Combine like terms: 13 + -13 = 0 0 + -1r = -4 + -13 -1r = -4 + -13 Combine like terms: -4 + -13 = -17 -1r = -17 Divide each side by '-1'. r = 17 Simplifying r = 17
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