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Simplifying 21 + 9r = 20 + 8r Solving 21 + 9r = 20 + 8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8r' to each side of the equation. 21 + 9r + -8r = 20 + 8r + -8r Combine like terms: 9r + -8r = 1r 21 + 1r = 20 + 8r + -8r Combine like terms: 8r + -8r = 0 21 + 1r = 20 + 0 21 + 1r = 20 Add '-21' to each side of the equation. 21 + -21 + 1r = 20 + -21 Combine like terms: 21 + -21 = 0 0 + 1r = 20 + -21 1r = 20 + -21 Combine like terms: 20 + -21 = -1 1r = -1 Divide each side by '1'. r = -1 Simplifying r = -1
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