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2014-06-01T12:21:51+03:00
X/4= x-120  aducem la acelasi numitor

x=4x-480

x-4x=-480

-3x=-480

3x=480

x=160
12 3 12
2014-06-01T12:26:25+03:00

x-120=x/4
x-x/4=120

aducem la acelasi numitor
4x-x=120x4
3x=480
x=480/3
x=160bile
verificare
160/4=160-120
40=40
10 3 10