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aflati x: x+1supra3 = 4,2supra7 VREAU REZOLVARE

Răspuns :

(x + 1) / 3 = 4,2 / 7  
x + 1 =3 × 4,2 / 7  
x = 1,8 - 1  
x = 0,8  
(x+1)/3 egal 4 intreg 2/7
(x+1) : 3 egal 30/7
x+1 egal 30/7 · 3
x+1 egal 90/7
x egal 90/7 -1
x egal 83/7
x egal 11, 6/7