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Simplifying 3r + -5 = -21 + r Reorder the terms: -5 + 3r = -21 + r Solving -5 + 3r = -21 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. -5 + 3r + -1r = -21 + r + -1r Combine like terms: 3r + -1r = 2r -5 + 2r = -21 + r + -1r Combine like terms: r + -1r = 0 -5 + 2r = -21 + 0 -5 + 2r = -21 Add '5' to each side of the equation. -5 + 5 + 2r = -21 + 5 Combine like terms: -5 + 5 = 0 0 + 2r = -21 + 5 2r = -21 + 5 Combine like terms: -21 + 5 = -16 2r = -16 Divide each side by '2'. r = -8 Simplifying r = -8
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