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x=3
spr. L=3*3-6=3=P
5x=-10
x=-2
spr. L=-12+9=-3
P=-2-1=-3
-x=1
x=-1
spr. L=1+1=2=P
3x-x=6
2x=6//2
x=3
6x+9=x-1
6x-x=-9+1
5x=10// 5
x=2
-x+1=2
-x=2
3x-x=6 ....... 9-6=3
2x=6/2
x=3
2. 6x+9=x-1 ...... spr.: 6*(-2)+9=-2-1
6x-x=-1-9 ...... - 12+9=-3
5x=-10/:5
x=-2
3.-x+1=2 .... spr.: 1+1=2
-x=2-1
-x=1