0,3x- (5+0,7y)-(0,9-0,1x)+(x-0,1) =
0,3x- (5+0,7y)-(0,9-0,1x)+(x-0,1) = 0,3x-5-0,7y-0,9+0,1x+x-0,1=
=1,4x-0,7y -6
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0,3x- (5+0,7y)-(0,9-0,1x)+(x-0,1) = 0,3x-5-0,7y-0,9+0,1x+x-0,1=
=1,4x-0,7y -6