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[ 12+(57,3 - x ) :0,1 ] :10²=3

Răspuns :

[12+(57.3-X):0.1]:100=3
[12+(57.3-X):0.1]=3X100
[12+(57.3-X):0.1]=300
12+(57.3-X):0.1=300
(57.3-X):0.1=300-12
57.3-X=288:0.1
57.3-X=2880
X=57.3-2880
X= -2822.7