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-5x-1=-4
1-5=-4-1
(x-1) (5x +1 = b)
x=1
1-1=0
5+1=6
c) (1-x)
x=1
5+1=6
- z minusem daje +
1+1=2
6+2=8
d)5x2-1
5+5=10
10+2=12
12-1=11