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Simplifying 30 = -9r + -4r Combine like terms: -9r + -4r = -13r 30 = -13r Solving 30 = -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. 30 + 13r = -13r + 13r Combine like terms: -13r + 13r = 0 30 + 13r = 0 Add '-30' to each side of the equation. 30 + -30 + 13r = 0 + -30 Combine like terms: 30 + -30 = 0 0 + 13r = 0 + -30 13r = 0 + -30 Combine like terms: 0 + -30 = -30 13r = -30 Divide each side by '13'. r = -2.307692308 Simplifying r = -2.307692308
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