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Simplifying 4 + -8(5 + -1r) = 0 4 + (5 * -8 + -1r * -8) = 0 4 + (-40 + 8r) = 0 Combine like terms: 4 + -40 = -36 -36 + 8r = 0 Solving -36 + 8r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '36' to each side of the equation. -36 + 36 + 8r = 0 + 36 Combine like terms: -36 + 36 = 0 0 + 8r = 0 + 36 8r = 0 + 36 Combine like terms: 0 + 36 = 36 8r = 36 Divide each side by '8'. r = 4.5 Simplifying r = 4.5
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