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Simplifying 21 = 2r + 1 Reorder the terms: 21 = 1 + 2r Solving 21 = 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 + -2r = 1 + 2r + -2r Combine like terms: 2r + -2r = 0 21 + -2r = 1 + 0 21 + -2r = 1 Add '-21' to each side of the equation. 21 + -21 + -2r = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -2r = 1 + -21 -2r = 1 + -21 Combine like terms: 1 + -21 = -20 -2r = -20 Divide each side by '-2'. r = 10 Simplifying r = 10
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