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maka:
A = 2/7.( 180-A)
A = 360/7 - 2/7A
A+2/7A = 360/7
7/7A+2/7A = 360/7
9/7A = 360/7
A = 360/7 : 9/7
A = 360/7 . 7/9
A = 40˚ ...(C)
x = 2/7 ( 180 - x) ----> kalikan semua ruas dgn 7, biar pecahan ilang
7x = 2 ( 180 - x)
7x = 360 - 2x
7x + 2x = 360
9x = 360
x = 40 (C)