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Simplifying -5(8 + -2r) = 0 (8 * -5 + -2r * -5) = 0 (-40 + 10r) = 0 Solving -40 + 10r = 0 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 + 10r = 0 + 40 Combine like terms: -40 + 40 = 0 0 + 10r = 0 + 40 10r = 0 + 40 Combine like terms: 0 + 40 = 40 10r = 40 Divide each side by '10'. r = 4 Simplifying r = 4
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