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Simplifying 2r + -1r + 7 + 4r = 0 Reorder the terms: 7 + 2r + -1r + 4r = 0 Combine like terms: 2r + -1r = 1r 7 + 1r + 4r = 0 Combine like terms: 1r + 4r = 5r 7 + 5r = 0 Solving 7 + 5r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + 5r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + 5r = 0 + -7 5r = 0 + -7 Combine like terms: 0 + -7 = -7 5r = -7 Divide each side by '5'. r = -1.4 Simplifying r = -1.4
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