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Simplifying R + 21 = -3(-7 + -6r) Reorder the terms: 21 + R = -3(-7 + -6r) 21 + R = (-7 * -3 + -6r * -3) 21 + R = (21 + 18r) Add '-21' to each side of the equation. 21 + -21 + R = 21 + -21 + 18r Combine like terms: 21 + -21 = 0 0 + R = 21 + -21 + 18r R = 21 + -21 + 18r Combine like terms: 21 + -21 = 0 R = 0 + 18r R = 18r Solving R = 18r Solving for variable 'R'. Move all terms containing R to the left, all other terms to the right. Simplifying R = 18r
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