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Simplifying -5(1 + -7r) + 4r = 307 (1 * -5 + -7r * -5) + 4r = 307 (-5 + 35r) + 4r = 307 Combine like terms: 35r + 4r = 39r -5 + 39r = 307 Solving -5 + 39r = 307 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 39r = 307 + 5 Combine like terms: -5 + 5 = 0 0 + 39r = 307 + 5 39r = 307 + 5 Combine like terms: 307 + 5 = 312 39r = 312 Divide each side by '39'. r = 8 Simplifying r = 8
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