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Simplifying 1 + -1(r + -2) = -3 Reorder the terms: 1 + -1(-2 + r) = -3 1 + (-2 * -1 + r * -1) = -3 1 + (2 + -1r) = -3 Combine like terms: 1 + 2 = 3 3 + -1r = -3 Solving 3 + -1r = -3 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1r = -3 + -3 Combine like terms: 3 + -3 = 0 0 + -1r = -3 + -3 -1r = -3 + -3 Combine like terms: -3 + -3 = -6 -1r = -6 Divide each side by '-1'. r = 6 Simplifying r = 6
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