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1/2 - (1,2 x 5/12 - a) : 1/8 = 1,3
0,5 - (1/2 - a) * 8 = 1,3
0,5 - 4 + 8a = 1,3
8a = 1,3 - 0,5 + 4
8a = 4,8 /:8
a = 0,6