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Simplifying -9 + -7(1 + 6r) = 25 -9 + (1 * -7 + 6r * -7) = 25 -9 + (-7 + -42r) = 25 Combine like terms: -9 + -7 = -16 -16 + -42r = 25 Solving -16 + -42r = 25 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + -42r = 25 + 16 Combine like terms: -16 + 16 = 0 0 + -42r = 25 + 16 -42r = 25 + 16 Combine like terms: 25 + 16 = 41 -42r = 41 Divide each side by '-42'. r = -0.9761904762 Simplifying r = -0.9761904762
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