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We'll begin by recalling the fact that the sum of the angles of triangle is of 180 degrees.
Since the two angles of triangle measure each 70 degrees, then we'll get:
70 + 70 + x = 180
140 + x = 180
x = 180 - 140
x = 40 degrees
The third angle of the isosceles triangle is x = 40 degrees.
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