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Simplifying 2r + 3(r + -5) = 20 Reorder the terms: 2r + 3(-5 + r) = 20 2r + (-5 * 3 + r * 3) = 20 2r + (-15 + 3r) = 20 Reorder the terms: -15 + 2r + 3r = 20 Combine like terms: 2r + 3r = 5r -15 + 5r = 20 Solving -15 + 5r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5r = 20 + 15 Combine like terms: -15 + 15 = 0 0 + 5r = 20 + 15 5r = 20 + 15 Combine like terms: 20 + 15 = 35 5r = 35 Divide each side by '5'. r = 7 Simplifying r = 7
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