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3x + 6x=

=(3.6).2x

=18.2x

=36x

=36.x+x+x+x+x+x

=36.3.x.3.x

[call 3.x=xy]

=36xy.xy

=36.(xy/:x/.3/).(xy/:x/.3/)

=36.0

=0

=>3x+6x=0

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lanh do thi

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4y ago

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