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Simplifying 40r + -39 = 61r + -81 Reorder the terms: -39 + 40r = 61r + -81 Reorder the terms: -39 + 40r = -81 + 61r Solving -39 + 40r = -81 + 61r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-61r' to each side of the equation. -39 + 40r + -61r = -81 + 61r + -61r Combine like terms: 40r + -61r = -21r -39 + -21r = -81 + 61r + -61r Combine like terms: 61r + -61r = 0 -39 + -21r = -81 + 0 -39 + -21r = -81 Add '39' to each side of the equation. -39 + 39 + -21r = -81 + 39 Combine like terms: -39 + 39 = 0 0 + -21r = -81 + 39 -21r = -81 + 39 Combine like terms: -81 + 39 = -42 -21r = -42 Divide each side by '-21'. r = 2 Simplifying r = 2
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