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Simplifying 4 = 4 + -6r + -7r Combine like terms: -6r + -7r = -13r 4 = 4 + -13r Add '-4' to each side of the equation. 4 + -4 = 4 + -4 + -13r Combine like terms: 4 + -4 = 0 0 = 4 + -4 + -13r Combine like terms: 4 + -4 = 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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