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x : 2 -4 = 8 : 12
x : 2 - 4 = 0,66
x : 2 = 0,66 + 4
x : 2 = 4,66
x = 4, 66 .2
x = 9, 32
Comprobamos:
9, 32 : 2 - 4 . 12 = 7, 92 ( redondeando te da 8)