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Simplifying 8 + -4r = (-8r + 7) Reorder the terms: 8 + -4r = (7 + -8r) Remove parenthesis around (7 + -8r) 8 + -4r = 7 + -8r Solving 8 + -4r = 7 + -8r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '8r' to each side of the equation. 8 + -4r + 8r = 7 + -8r + 8r Combine like terms: -4r + 8r = 4r 8 + 4r = 7 + -8r + 8r Combine like terms: -8r + 8r = 0 8 + 4r = 7 + 0 8 + 4r = 7 Add '-8' to each side of the equation. 8 + -8 + 4r = 7 + -8 Combine like terms: 8 + -8 = 0 0 + 4r = 7 + -8 4r = 7 + -8 Combine like terms: 7 + -8 = -1 4r = -1 Divide each side by '4'. r = -0.25 Simplifying r = -0.25
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