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Simplifying -5(r + 8) = -91 Reorder the terms: -5(8 + r) = -91 (8 * -5 + r * -5) = -91 (-40 + -5r) = -91 Solving -40 + -5r = -91 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + -5r = -91 + 40 Combine like terms: -40 + 40 = 0 0 + -5r = -91 + 40 -5r = -91 + 40 Combine like terms: -91 + 40 = -51 -5r = -51 Divide each side by '-5'. r = 10.2 Simplifying r = 10.2
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