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2(4X-6 la puterea 2)+5=21 va rog repede!!!

Răspuns :

=2(4X-36)+5=21
=2 (4X-36)=21-5
=2 (4X-36)=16
=4X-36=16÷2
=4X-36=8
=4X=8+36
=4X=44
=X=44÷4
=X=11
SPER CA TE AM AJUTAT!