The sum of all interior angles of a triangle is 180°, so:
79° + 2x + 10° + (180° - 6x - 1°) = 180°
79 + 2x + 10 + 180 - 6x -1 = 180
79 + 2x + 10 - 6x - 1 = 0
88 - 4x = 0
88 = 4x
x = 88/4
x = 22
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