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Simplifying -13 + -7r = r + 3 Reorder the terms: -13 + -7r = 3 + r Solving -13 + -7r = 3 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -13 + -7r + -1r = 3 + r + -1r Combine like terms: -7r + -1r = -8r -13 + -8r = 3 + r + -1r Combine like terms: r + -1r = 0 -13 + -8r = 3 + 0 -13 + -8r = 3 Add '13' to each side of the equation. -13 + 13 + -8r = 3 + 13 Combine like terms: -13 + 13 = 0 0 + -8r = 3 + 13 -8r = 3 + 13 Combine like terms: 3 + 13 = 16 -8r = 16 Divide each side by '-8'. r = -2 Simplifying r = -2
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