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Simplifying 9 + -4r + -7 = 0 Reorder the terms: 9 + -7 + -4r = 0 Combine like terms: 9 + -7 = 2 2 + -4r = 0 Solving 2 + -4r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -4r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -4r = 0 + -2 -4r = 0 + -2 Combine like terms: 0 + -2 = -2 -4r = -2 Divide each side by '-4'. r = 0.5 Simplifying r = 0.5
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