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Mathematics, 27.01.2021 01:00 jak000067oyyfia

The sum of the angle measures in a triangle is 180 degrees. The three side lengths are 3x, x, and 40. Write & solve an equation to find x.

(I need the answer by either 11:00pm or 7:50am *eastern time* thanks)

(Oh and if you want to put a explanation you can)

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