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Simplifying -4 + -4(1 + 6r) = -80 -4 + (1 * -4 + 6r * -4) = -80 -4 + (-4 + -24r) = -80 Combine like terms: -4 + -4 = -8 -8 + -24r = -80 Solving -8 + -24r = -80 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 + -24r = -80 + 8 Combine like terms: -8 + 8 = 0 0 + -24r = -80 + 8 -24r = -80 + 8 Combine like terms: -80 + 8 = -72 -24r = -72 Divide each side by '-24'. r = 3 Simplifying r = 3
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