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Simplifying 21 = r + -12 Reorder the terms: 21 = -12 + r Solving 21 = -12 + 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. 21 + -1r = -12 + r + -1r Combine like terms: r + -1r = 0 21 + -1r = -12 + 0 21 + -1r = -12 Add '-21' to each side of the equation. 21 + -21 + -1r = -12 + -21 Combine like terms: 21 + -21 = 0 0 + -1r = -12 + -21 -1r = -12 + -21 Combine like terms: -12 + -21 = -33 -1r = -33 Divide each side by '-1'. r = 33 Simplifying r = 33
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