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5,3+6,9+x+0,4=4x VA MULTUMESC

Răspuns :

5,3+6,9+x+0,4=4x
12.6=3x
x=4.2
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5,3+6,9+x+0,4=4x
12,6+x=4x
12,6=4x-x
x=12,6:3
x=4,2