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Simplifying -7 = r + (-13) -7 = r + -13 Reorder the terms: -7 = -13 + r Solving -7 = -13 + 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. -7 + -1r = -13 + r + -1r Combine like terms: r + -1r = 0 -7 + -1r = -13 + 0 -7 + -1r = -13 Add '7' to each side of the equation. -7 + 7 + -1r = -13 + 7 Combine like terms: -7 + 7 = 0 0 + -1r = -13 + 7 -1r = -13 + 7 Combine like terms: -13 + 7 = -6 -1r = -6 Divide each side by '-1'. r = 6 Simplifying r = 6
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