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Simplifying 4r + -7r + 7 + r = 0 Reorder the terms: 7 + 4r + -7r + r = 0 Combine like terms: 4r + -7r = -3r 7 + -3r + r = 0 Combine like terms: -3r + r = -2r 7 + -2r = 0 Solving 7 + -2r = 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 + -2r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -2r = 0 + -7 -2r = 0 + -7 Combine like terms: 0 + -7 = -7 -2r = -7 Divide each side by '-2'. r = 3.5 Simplifying r = 3.5
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