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Simplifying 20 + r = r + -2(3r + 3) Reorder the terms: 20 + r = r + -2(3 + 3r) 20 + r = r + (3 * -2 + 3r * -2) 20 + r = r + (-6 + -6r) Reorder the terms: 20 + r = -6 + r + -6r Combine like terms: r + -6r = -5r 20 + r = -6 + -5r Solving 20 + r = -6 + -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. 20 + r + 5r = -6 + -5r + 5r Combine like terms: r + 5r = 6r 20 + 6r = -6 + -5r + 5r Combine like terms: -5r + 5r = 0 20 + 6r = -6 + 0 20 + 6r = -6 Add '-20' to each side of the equation. 20 + -20 + 6r = -6 + -20 Combine like terms: 20 + -20 = 0 0 + 6r = -6 + -20 6r = -6 + -20 Combine like terms: -6 + -20 = -26 6r = -26 Divide each side by '6'. r = -4.333333333 Simplifying r = -4.333333333
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