Explanation:
(6x - 5) + (12x - 5) = 180
6x + 12x = 180 + 5 + 5
18x = 190
x = 190/18
x ≃ 10.55
6x - 5 → 6 * 10.55 - 5 = 58.3
12x - 5 → 12 * 10.5 - 5 = 121.5
58 + 121 = 179.9
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