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Simplifying 8 + -7(1 + -6r) = -17 8 + (1 * -7 + -6r * -7) = -17 8 + (-7 + 42r) = -17 Combine like terms: 8 + -7 = 1 1 + 42r = -17 Solving 1 + 42r = -17 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 42r = -17 + -1 Combine like terms: 1 + -1 = 0 0 + 42r = -17 + -1 42r = -17 + -1 Combine like terms: -17 + -1 = -18 42r = -18 Divide each side by '42'. r = -0.4285714286 Simplifying r = -0.4285714286
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