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Simplifying 13 + -2r = r + 7 + -8r Reorder the terms: 13 + -2r = 7 + r + -8r Combine like terms: r + -8r = -7r 13 + -2r = 7 + -7r Solving 13 + -2r = 7 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. 13 + -2r + 7r = 7 + -7r + 7r Combine like terms: -2r + 7r = 5r 13 + 5r = 7 + -7r + 7r Combine like terms: -7r + 7r = 0 13 + 5r = 7 + 0 13 + 5r = 7 Add '-13' to each side of the equation. 13 + -13 + 5r = 7 + -13 Combine like terms: 13 + -13 = 0 0 + 5r = 7 + -13 5r = 7 + -13 Combine like terms: 7 + -13 = -6 5r = -6 Divide each side by '5'. r = -1.2 Simplifying r = -1.2
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