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Simplifying 4r + -7r + 8 + r = 0 Reorder the terms: 8 + 4r + -7r + r = 0 Combine like terms: 4r + -7r = -3r 8 + -3r + r = 0 Combine like terms: -3r + r = -2r 8 + -2r = 0 Solving 8 + -2r = 0 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -2r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -2r = 0 + -8 -2r = 0 + -8 Combine like terms: 0 + -8 = -8 -2r = -8 Divide each side by '-2'. r = 4 Simplifying r = 4
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