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Simplifying 2r + -21 = 3 + -4r Reorder the terms: -21 + 2r = 3 + -4r Solving -21 + 2r = 3 + -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. -21 + 2r + 4r = 3 + -4r + 4r Combine like terms: 2r + 4r = 6r -21 + 6r = 3 + -4r + 4r Combine like terms: -4r + 4r = 0 -21 + 6r = 3 + 0 -21 + 6r = 3 Add '21' to each side of the equation. -21 + 21 + 6r = 3 + 21 Combine like terms: -21 + 21 = 0 0 + 6r = 3 + 21 6r = 3 + 21 Combine like terms: 3 + 21 = 24 6r = 24 Divide each side by '6'. r = 4 Simplifying r = 4
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