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Simplifying 160 = -8(1 + -7r) 160 = (1 * -8 + -7r * -8) 160 = (-8 + 56r) Solving 160 = -8 + 56r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-56r' to each side of the equation. 160 + -56r = -8 + 56r + -56r Combine like terms: 56r + -56r = 0 160 + -56r = -8 + 0 160 + -56r = -8 Add '-160' to each side of the equation. 160 + -160 + -56r = -8 + -160 Combine like terms: 160 + -160 = 0 0 + -56r = -8 + -160 -56r = -8 + -160 Combine like terms: -8 + -160 = -168 -56r = -168 Divide each side by '-56'. r = 3 Simplifying r = 3
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