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Simplifying r + 4 = 4 + -6r + -7r Reorder the terms: 4 + r = 4 + -6r + -7r Combine like terms: -6r + -7r = -13r 4 + r = 4 + -13r Add '-4' to each side of the equation. 4 + -4 + r = 4 + -4 + -13r Combine like terms: 4 + -4 = 0 0 + r = 4 + -4 + -13r r = 4 + -4 + -13r Combine like terms: 4 + -4 = 0 r = 0 + -13r r = -13r Solving r = -13r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '13r' to each side of the equation. r + 13r = -13r + 13r Combine like terms: r + 13r = 14r 14r = -13r + 13r Combine like terms: -13r + 13r = 0 14r = 0 Divide each side by '14'. r = 0 Simplifying r = 0
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