Răspunsuri

2014-11-06T17:27:10+02:00

x+2x+x+4x+5x=x+2x+3x+4x+25
x+2x+3x+4x+5x-x-2x-3x-4x=25
5x=25
x=5
marcheaza-l daca e cel mai bun raspuns.multumesc!