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Simplifying -1(3 + -1r) = -7r + -3 + 2r (3 * -1 + -1r * -1) = -7r + -3 + 2r (-3 + 1r) = -7r + -3 + 2r Reorder the terms: -3 + 1r = -3 + -7r + 2r Combine like terms: -7r + 2r = -5r -3 + 1r = -3 + -5r Add '3' to each side of the equation. -3 + 3 + 1r = -3 + 3 + -5r Combine like terms: -3 + 3 = 0 0 + 1r = -3 + 3 + -5r 1r = -3 + 3 + -5r Combine like terms: -3 + 3 = 0 1r = 0 + -5r 1r = -5r Solving 1r = -5r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5r' to each side of the equation. 1r + 5r = -5r + 5r Combine like terms: 1r + 5r = 6r 6r = -5r + 5r Combine like terms: -5r + 5r = 0 6r = 0 Divide each side by '6'. r = 0 Simplifying r = 0
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