Răspunsuri

2014-10-31T17:10:02+02:00
A-b=6
7·a-7·b+x=55
7(a-b)+x=55
42+x=55
x=55-42
x=13
14.De ce??
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2014-10-31T17:13:00+02:00
7(a-b)+x=55
42+x=55
x=13