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Simplifying -12 = r + -20 Reorder the terms: -12 = -20 + r Solving -12 = -20 + 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 = -20 + r + -1r Combine like terms: r + -1r = 0 -12 + -1r = -20 + 0 -12 + -1r = -20 Add '12' to each side of the equation. -12 + 12 + -1r = -20 + 12 Combine like terms: -12 + 12 = 0 0 + -1r = -20 + 12 -1r = -20 + 12 Combine like terms: -20 + 12 = -8 -1r = -8 Divide each side by '-1'. r = 8 Simplifying r = 8
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