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rezolvati ecuatia [1,(3)x/2-21/4]:0,6=x/9,undex apartine Q
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Răspuns :

[1.(3)x/2-21/4]/0.6=x/9
(2/3x-21/4) *5/3=x/9   *9
3(2/3x-5.25)*5=x
2x-3*5.25=x⇒x=3*5.25=15.75