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2010-01-12T21:17:00+01:00
3x=12

x=12:3
x=4
x=4
4-y=1
-y=1-4
-y=-3/-1
y=3

5y=2
x+y=2 1
y=2;5 y=0,4
x+0,4=2 x=2-0,4 x=1,6
4y-x=6
17y=0 x+3y=3
x-y=5
x=5+y
5+y+3y=3
4y= -2
y= -2:4
y=-1/2
5+(-1/2)+3(-1/2)=3
41/2+6/2(-1/2)=3
4i1/2 +(-3/2)=3
3=3


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