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cum se calculeaza c)?

Cum Se Calculeaza C class=

Răspuns :

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(5x-x-7):10=(5x-5-4x-4+11):20
(4x-7):10=(x+2)20
(8x-14-x-2):20=0
(7x-16):20=0
(7x):20=16:10
7x=16
x=16:7