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Simplifying 189 = 21r Solving 189 = 21r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-21r' to each side of the equation. 189 + -21r = 21r + -21r Combine like terms: 21r + -21r = 0 189 + -21r = 0 Add '-189' to each side of the equation. 189 + -189 + -21r = 0 + -189 Combine like terms: 189 + -189 = 0 0 + -21r = 0 + -189 -21r = 0 + -189 Combine like terms: 0 + -189 = -189 -21r = -189 Divide each side by '-21'. r = 9 Simplifying r = 9
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