Răspunsuri

2014-11-13T15:56:12+02:00
9x+6+3x=4x+70
12x-4x=70-6
8x=64
x=64/8
x=8
6(x+2)=20
6x+12=20
6x=20-12
x=8/6
39x+20=24
39x=24-20
x=4/39
la primul nu stiu cum vine