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Simplifying 10r + -21r = -4r + 6 Combine like terms: 10r + -21r = -11r -11r = -4r + 6 Reorder the terms: -11r = 6 + -4r Solving -11r = 6 + -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -11r + 4r = 6 + -4r + 4r Combine like terms: -11r + 4r = -7r -7r = 6 + -4r + 4r Combine like terms: -4r + 4r = 0 -7r = 6 + 0 -7r = 6 Divide each side by '-7'. r = -0.8571428571 Simplifying r = -0.8571428571
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