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Simplifying 9 + -1r = 21r + -19 Reorder the terms: 9 + -1r = -19 + 21r Solving 9 + -1r = -19 + 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. 9 + -1r + -21r = -19 + 21r + -21r Combine like terms: -1r + -21r = -22r 9 + -22r = -19 + 21r + -21r Combine like terms: 21r + -21r = 0 9 + -22r = -19 + 0 9 + -22r = -19 Add '-9' to each side of the equation. 9 + -9 + -22r = -19 + -9 Combine like terms: 9 + -9 = 0 0 + -22r = -19 + -9 -22r = -19 + -9 Combine like terms: -19 + -9 = -28 -22r = -28 Divide each side by '-22'. r = 1.272727273 Simplifying r = 1.272727273
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