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Simplifying -7r + -1 = 13 Reorder the terms: -1 + -7r = 13 Solving -1 + -7r = 13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -7r = 13 + 1 Combine like terms: -1 + 1 = 0 0 + -7r = 13 + 1 -7r = 13 + 1 Combine like terms: 13 + 1 = 14 -7r = 14 Divide each side by '-7'. r = -2 Simplifying r = -2
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