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Simplifying 12 + -1(r + 1) = 21 Reorder the terms: 12 + -1(1 + r) = 21 12 + (1 * -1 + r * -1) = 21 12 + (-1 + -1r) = 21 Combine like terms: 12 + -1 = 11 11 + -1r = 21 Solving 11 + -1r = 21 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1r = 21 + -11 Combine like terms: 11 + -11 = 0 0 + -1r = 21 + -11 -1r = 21 + -11 Combine like terms: 21 + -11 = 10 -1r = 10 Divide each side by '-1'. r = -10 Simplifying r = -10
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