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calculati ecuatiile: 404-x pe9=20,65;  4+2x=1;  5x-23=3x+7.
 
va rog foarte mult!!!!


Răspuns :

4+2x=1⇒2x=1-4⇒x=[tex] \frac{-3}{2} [/tex]
5x-23=3x+7⇔2x=30⇒x=15


404-x=9*20
-x=180-404
x=224
2x=-3
x=-3 pe 2
5x-3x=7+23
2x=30
x=15