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Simplifying 3(r + 30) = 390 Reorder the terms: 3(30 + r) = 390 (30 * 3 + r * 3) = 390 (90 + 3r) = 390 Solving 90 + 3r = 390 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 3r = 390 + -90 Combine like terms: 90 + -90 = 0 0 + 3r = 390 + -90 3r = 390 + -90 Combine like terms: 390 + -90 = 300 3r = 300 Divide each side by '3'. r = 100 Simplifying r = 100
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