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Simplifying 8 = 4 + (r + 4) Reorder the terms: 8 = 4 + (4 + r) Remove parenthesis around (4 + r) 8 = 4 + 4 + r Combine like terms: 4 + 4 = 8 8 = 8 + r Add '-8' to each side of the equation. 8 + -8 = 8 + -8 + r Combine like terms: 8 + -8 = 0 0 = 8 + -8 + r Combine like terms: 8 + -8 = 0 0 = 0 + r 0 = r Solving 0 = 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. 0 + -1r = r + -1r Remove the zero: -1r = r + -1r Combine like terms: r + -1r = 0 -1r = 0 Divide each side by '-1'. r = 0 Simplifying r = 0
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