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Simplifying 12 = r + 6 + -2 Reorder the terms: 12 = 6 + -2 + r Combine like terms: 6 + -2 = 4 12 = 4 + r Solving 12 = 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. 12 + -1r = 4 + r + -1r Combine like terms: r + -1r = 0 12 + -1r = 4 + 0 12 + -1r = 4 Add '-12' to each side of the equation. 12 + -12 + -1r = 4 + -12 Combine like terms: 12 + -12 = 0 0 + -1r = 4 + -12 -1r = 4 + -12 Combine like terms: 4 + -12 = -8 -1r = -8 Divide each side by '-1'. r = 8 Simplifying r = 8
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