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Simplifying 154 + 7r + 5 = 180 Reorder the terms: 154 + 5 + 7r = 180 Combine like terms: 154 + 5 = 159 159 + 7r = 180 Solving 159 + 7r = 180 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-159' to each side of the equation. 159 + -159 + 7r = 180 + -159 Combine like terms: 159 + -159 = 0 0 + 7r = 180 + -159 7r = 180 + -159 Combine like terms: 180 + -159 = 21 7r = 21 Divide each side by '7'. r = 3 Simplifying r = 3
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