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Simplifying (-4r)(-30) + -1(-8) = 0 Remove parenthesis around (-4r) -4r(-30) + -1(-8) = 0 Reorder the terms for easier multiplication: -4 * -30r + -1(-8) = 0 Multiply -4 * -30 120r + -1(-8) = 0 Multiply -1 * -8 120r + 8 = 0 Reorder the terms: 8 + 120r = 0 Solving 8 + 120r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 120r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 120r = 0 + -8 120r = 0 + -8 Combine like terms: 0 + -8 = -8 120r = -8 Divide each side by '120'. r = -0.06666666667 Simplifying r = -0.06666666667
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