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Simplifying 6r + -21 = 1 + 2r Reorder the terms: -21 + 6r = 1 + 2r Solving -21 + 6r = 1 + 2r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2r' to each side of the equation. -21 + 6r + -2r = 1 + 2r + -2r Combine like terms: 6r + -2r = 4r -21 + 4r = 1 + 2r + -2r Combine like terms: 2r + -2r = 0 -21 + 4r = 1 + 0 -21 + 4r = 1 Add '21' to each side of the equation. -21 + 21 + 4r = 1 + 21 Combine like terms: -21 + 21 = 0 0 + 4r = 1 + 21 4r = 1 + 21 Combine like terms: 1 + 21 = 22 4r = 22 Divide each side by '4'. r = 5.5 Simplifying r = 5.5
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