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afla necunoscuta 10x10x10 ( 100-2x X-6x10)x10=900

Răspuns :

=10x10x10 (100-2X-60)x10=900
=10x10x10 (40-2X)x10=900
=10.000 (40-2X)=900
=400.000-20.000X=900
= -20.000X=900-400.000
= -20.000X= -399.110
= X=3991/200