(х-1,2):0,6=21,1 (х-1,2)=21,1*0,6 х-1,2=12,66 х=12,66+1.2 х=13,86
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(х-1,2):0,6=21,1 (х-1,2)=21,1*0,6 х-1,2=12,66 х=12,66+1.2 х=13,86