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Simplifying 8 + -4(-1r + 5) = 0 Reorder the terms: 8 + -4(5 + -1r) = 0 8 + (5 * -4 + -1r * -4) = 0 8 + (-20 + 4r) = 0 Combine like terms: 8 + -20 = -12 -12 + 4r = 0 Solving -12 + 4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 4r = 0 + 12 Combine like terms: -12 + 12 = 0 0 + 4r = 0 + 12 4r = 0 + 12 Combine like terms: 0 + 12 = 12 4r = 12 Divide each side by '4'. r = 3 Simplifying r = 3
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