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-x=4+1
-x=5/*(-1)
x=-5
b)x-1+x=2
2x=2+1
2x=3 /:2
x=1,5
c)x+4+1=2x
5=2x-x
5=x
d)3-x=x-1
3+1=x+x
4=2x/:2
x=2
e)2x+4-2x=4
0x=4-4
0=0
f)