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Aflati " X " din : a) (12 + X ) + 14 = 4 · X - 4 ;

Răspuns :

12+x+14=4x-4

26+x=4x-4

x-4x=-4-26

-3x=-30

x=10


12+x+14=4x-4
12+14+4=4x-x
30=3x
x=30/3
x=10