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Simplifying 13r + 5 = r + -7 Reorder the terms: 5 + 13r = r + -7 Reorder the terms: 5 + 13r = -7 + r Solving 5 + 13r = -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. 5 + 13r + -1r = -7 + r + -1r Combine like terms: 13r + -1r = 12r 5 + 12r = -7 + r + -1r Combine like terms: r + -1r = 0 5 + 12r = -7 + 0 5 + 12r = -7 Add '-5' to each side of the equation. 5 + -5 + 12r = -7 + -5 Combine like terms: 5 + -5 = 0 0 + 12r = -7 + -5 12r = -7 + -5 Combine like terms: -7 + -5 = -12 12r = -12 Divide each side by '12'. r = -1 Simplifying r = -1
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