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Simplifying -13 = 7 + r Solving -13 = 7 + 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 + -1r = 7 + r + -1r Combine like terms: r + -1r = 0 -13 + -1r = 7 + 0 -13 + -1r = 7 Add '13' to each side of the equation. -13 + 13 + -1r = 7 + 13 Combine like terms: -13 + 13 = 0 0 + -1r = 7 + 13 -1r = 7 + 13 Combine like terms: 7 + 13 = 20 -1r = 20 Divide each side by '-1'. r = -20 Simplifying r = -20
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