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Simplifying 4r + -9r + -7 + 9 = 0 Reorder the terms: -7 + 9 + 4r + -9r = 0 Combine like terms: -7 + 9 = 2 2 + 4r + -9r = 0 Combine like terms: 4r + -9r = -5r 2 + -5r = 0 Solving 2 + -5r = 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 + -5r = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -5r = 0 + -2 -5r = 0 + -2 Combine like terms: 0 + -2 = -2 -5r = -2 Divide each side by '-5'. r = 0.4 Simplifying r = 0.4
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