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Simplifying 5r + 3(2r + -5) = 7 Reorder the terms: 5r + 3(-5 + 2r) = 7 5r + (-5 * 3 + 2r * 3) = 7 5r + (-15 + 6r) = 7 Reorder the terms: -15 + 5r + 6r = 7 Combine like terms: 5r + 6r = 11r -15 + 11r = 7 Solving -15 + 11r = 7 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 + 11r = 7 + 15 Combine like terms: -15 + 15 = 0 0 + 11r = 7 + 15 11r = 7 + 15 Combine like terms: 7 + 15 = 22 11r = 22 Divide each side by '11'. r = 2 Simplifying r = 2
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