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Simplifying -7 + 5(1 + 7r) = -247 -7 + (1 * 5 + 7r * 5) = -247 -7 + (5 + 35r) = -247 Combine like terms: -7 + 5 = -2 -2 + 35r = -247 Solving -2 + 35r = -247 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + 35r = -247 + 2 Combine like terms: -2 + 2 = 0 0 + 35r = -247 + 2 35r = -247 + 2 Combine like terms: -247 + 2 = -245 35r = -245 Divide each side by '35'. r = -7 Simplifying r = -7
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