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Simplifying 4(r + -8) + 20 = 5 Reorder the terms: 4(-8 + r) + 20 = 5 (-8 * 4 + r * 4) + 20 = 5 (-32 + 4r) + 20 = 5 Reorder the terms: -32 + 20 + 4r = 5 Combine like terms: -32 + 20 = -12 -12 + 4r = 5 Solving -12 + 4r = 5 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 = 5 + 12 Combine like terms: -12 + 12 = 0 0 + 4r = 5 + 12 4r = 5 + 12 Combine like terms: 5 + 12 = 17 4r = 17 Divide each side by '4'. r = 4.25 Simplifying r = 4.25
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