Răspunsuri

2014-10-27T16:02:26+02:00
X+157=300-79
x+157=221
x=221-157
x=64

verifici inlocuindu-l pe x in ex.
2014-10-27T16:03:45+02:00
300-( x+ 157 ) _= 79 
x+ 157 = 300-79 
x+ 157= 221 
x= 221-157
x= 64
300-(
300-(*+157)=79 ; *=(*+157)=300-79 ; *=(*157)=221 ; *=221-157=64