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Simplifying (3r + 8) = (r + -4) Reorder the terms: (8 + 3r) = (r + -4) Remove parenthesis around (8 + 3r) 8 + 3r = (r + -4) Reorder the terms: 8 + 3r = (-4 + r) Remove parenthesis around (-4 + r) 8 + 3r = -4 + r Solving 8 + 3r = -4 + r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 8 + 3r + -1r = -4 + r + -1r Combine like terms: 3r + -1r = 2r 8 + 2r = -4 + r + -1r Combine like terms: r + -1r = 0 8 + 2r = -4 + 0 8 + 2r = -4 Add '-8' to each side of the equation. 8 + -8 + 2r = -4 + -8 Combine like terms: 8 + -8 = 0 0 + 2r = -4 + -8 2r = -4 + -8 Combine like terms: -4 + -8 = -12 2r = -12 Divide each side by '2'. r = -6 Simplifying r = -6
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