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Simplifying -2r = 8r + -5(3r + -4) Reorder the terms: -2r = 8r + -5(-4 + 3r) -2r = 8r + (-4 * -5 + 3r * -5) -2r = 8r + (20 + -15r) Reorder the terms: -2r = 20 + 8r + -15r Combine like terms: 8r + -15r = -7r -2r = 20 + -7r Solving -2r = 20 + -7r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '7r' to each side of the equation. -2r + 7r = 20 + -7r + 7r Combine like terms: -2r + 7r = 5r 5r = 20 + -7r + 7r Combine like terms: -7r + 7r = 0 5r = 20 + 0 5r = 20 Divide each side by '5'. r = 4 Simplifying r = 4
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