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Simplifying 3r + 3(r + -10) = 300 Reorder the terms: 3r + 3(-10 + r) = 300 3r + (-10 * 3 + r * 3) = 300 3r + (-30 + 3r) = 300 Reorder the terms: -30 + 3r + 3r = 300 Combine like terms: 3r + 3r = 6r -30 + 6r = 300 Solving -30 + 6r = 300 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 6r = 300 + 30 Combine like terms: -30 + 30 = 0 0 + 6r = 300 + 30 6r = 300 + 30 Combine like terms: 300 + 30 = 330 6r = 330 Divide each side by '6'. r = 55 Simplifying r = 55
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