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Simplifying 6r + 15 + -2r = -13 Reorder the terms: 15 + 6r + -2r = -13 Combine like terms: 6r + -2r = 4r 15 + 4r = -13 Solving 15 + 4r = -13 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4r = -13 + -15 Combine like terms: 15 + -15 = 0 0 + 4r = -13 + -15 4r = -13 + -15 Combine like terms: -13 + -15 = -28 4r = -28 Divide each side by '4'. r = -7 Simplifying r = -7
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