Răspuns :
x=3x/10+7x/10
3x/10+7x/10=3x/10+350
7x/10=350
x/10=350:7=50
x=50 ori 10=500
x=500
3x/10+7x/10=3x/10+350
7x/10=350
x/10=350:7=50
x=50 ori 10=500
x=500
[tex] \frac{3x}{10}+350=x
\frac{3x}{10}+\frac{3500}{10}=\frac{10x}{10}[/tex]
[3x+3500=10x
3500=10x-3x
3500=7x
x=3500:7=500