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Simplifying 8 = (r + -2) + 4 Reorder the terms: 8 = (-2 + r) + 4 Remove parenthesis around (-2 + r) 8 = -2 + r + 4 Reorder the terms: 8 = -2 + 4 + r Combine like terms: -2 + 4 = 2 8 = 2 + r Solving 8 = 2 + 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 + -1r = 2 + r + -1r Combine like terms: r + -1r = 0 8 + -1r = 2 + 0 8 + -1r = 2 Add '-8' to each side of the equation. 8 + -8 + -1r = 2 + -8 Combine like terms: 8 + -8 = 0 0 + -1r = 2 + -8 -1r = 2 + -8 Combine like terms: 2 + -8 = -6 -1r = -6 Divide each side by '-1'. r = 6 Simplifying r = 6
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