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Simplifying 21r + -6r = -6 + -21 Combine like terms: 21r + -6r = 15r 15r = -6 + -21 Combine like terms: -6 + -21 = -27 15r = -27 Solving 15r = -27 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Divide each side by '15'. r = -1.8 Simplifying r = -1.8
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