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Simplifying 4(r + -4) = 9 Reorder the terms: 4(-4 + r) = 9 (-4 * 4 + r * 4) = 9 (-16 + 4r) = 9 Solving -16 + 4r = 9 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 4r = 9 + 16 Combine like terms: -16 + 16 = 0 0 + 4r = 9 + 16 4r = 9 + 16 Combine like terms: 9 + 16 = 25 4r = 25 Divide each side by '4'. r = 6.25 Simplifying r = 6.25
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