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