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Simplifying -4r + -6(r + -5) = 80 Reorder the terms: -4r + -6(-5 + r) = 80 -4r + (-5 * -6 + r * -6) = 80 -4r + (30 + -6r) = 80 Reorder the terms: 30 + -4r + -6r = 80 Combine like terms: -4r + -6r = -10r 30 + -10r = 80 Solving 30 + -10r = 80 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + -10r = 80 + -30 Combine like terms: 30 + -30 = 0 0 + -10r = 80 + -30 -10r = 80 + -30 Combine like terms: 80 + -30 = 50 -10r = 50 Divide each side by '-10'. r = -5 Simplifying r = -5
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