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Simplifying -7 + -3(r + 8) = -104 Reorder the terms: -7 + -3(8 + r) = -104 -7 + (8 * -3 + r * -3) = -104 -7 + (-24 + -3r) = -104 Combine like terms: -7 + -24 = -31 -31 + -3r = -104 Solving -31 + -3r = -104 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '31' to each side of the equation. -31 + 31 + -3r = -104 + 31 Combine like terms: -31 + 31 = 0 0 + -3r = -104 + 31 -3r = -104 + 31 Combine like terms: -104 + 31 = -73 -3r = -73 Divide each side by '-3'. r = 24.33333333 Simplifying r = 24.33333333
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