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Simplifying 4r + -5(r + -5) = 0 Reorder the terms: 4r + -5(-5 + r) = 0 4r + (-5 * -5 + r * -5) = 0 4r + (25 + -5r) = 0 Reorder the terms: 25 + 4r + -5r = 0 Combine like terms: 4r + -5r = -1r 25 + -1r = 0 Solving 25 + -1r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -1r = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -1r = 0 + -25 -1r = 0 + -25 Combine like terms: 0 + -25 = -25 -1r = -25 Divide each side by '-1'. r = 25 Simplifying r = 25
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