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Simplifying 5r + -1(5 + -3r) = (3 + r) + -6 5r + (5 * -1 + -3r * -1) = (3 + r) + -6 5r + (-5 + 3r) = (3 + r) + -6 Reorder the terms: -5 + 5r + 3r = (3 + r) + -6 Combine like terms: 5r + 3r = 8r -5 + 8r = (3 + r) + -6 Remove parenthesis around (3 + r) -5 + 8r = 3 + r + -6 Reorder the terms: -5 + 8r = 3 + -6 + r Combine like terms: 3 + -6 = -3 -5 + 8r = -3 + r Solving -5 + 8r = -3 + 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. -5 + 8r + -1r = -3 + r + -1r Combine like terms: 8r + -1r = 7r -5 + 7r = -3 + r + -1r Combine like terms: r + -1r = 0 -5 + 7r = -3 + 0 -5 + 7r = -3 Add '5' to each side of the equation. -5 + 5 + 7r = -3 + 5 Combine like terms: -5 + 5 = 0 0 + 7r = -3 + 5 7r = -3 + 5 Combine like terms: -3 + 5 = 2 7r = 2 Divide each side by '7'. r = 0.2857142857 Simplifying r = 0.2857142857
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