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Simplifying 2r + -1(7r + -3) = 1 Reorder the terms: 2r + -1(-3 + 7r) = 1 2r + (-3 * -1 + 7r * -1) = 1 2r + (3 + -7r) = 1 Reorder the terms: 3 + 2r + -7r = 1 Combine like terms: 2r + -7r = -5r 3 + -5r = 1 Solving 3 + -5r = 1 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 + -5r = 1 + -3 Combine like terms: 3 + -3 = 0 0 + -5r = 1 + -3 -5r = 1 + -3 Combine like terms: 1 + -3 = -2 -5r = -2 Divide each side by '-5'. r = 0.4 Simplifying r = 0.4
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