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Simplifying -6r + -1r + -13 = 18 Reorder the terms: -13 + -6r + -1r = 18 Combine like terms: -6r + -1r = -7r -13 + -7r = 18 Solving -13 + -7r = 18 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 + -7r = 18 + 13 Combine like terms: -13 + 13 = 0 0 + -7r = 18 + 13 -7r = 18 + 13 Combine like terms: 18 + 13 = 31 -7r = 31 Divide each side by '-7'. r = -4.428571429 Simplifying r = -4.428571429
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