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Simplifying 8r + -4r + 4 = 7r + 4 + -1r Reorder the terms: 4 + 8r + -4r = 7r + 4 + -1r Combine like terms: 8r + -4r = 4r 4 + 4r = 7r + 4 + -1r Reorder the terms: 4 + 4r = 4 + 7r + -1r Combine like terms: 7r + -1r = 6r 4 + 4r = 4 + 6r Add '-4' to each side of the equation. 4 + -4 + 4r = 4 + -4 + 6r Combine like terms: 4 + -4 = 0 0 + 4r = 4 + -4 + 6r 4r = 4 + -4 + 6r Combine like terms: 4 + -4 = 0 4r = 0 + 6r 4r = 6r Solving 4r = 6r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-6r' to each side of the equation. 4r + -6r = 6r + -6r Combine like terms: 4r + -6r = -2r -2r = 6r + -6r Combine like terms: 6r + -6r = 0 -2r = 0 Divide each side by '-2'. r = 0 Simplifying r = 0
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