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30-17=x
13=x
x=13
y-45=54
54-45=y
y=9
a dalej to nie wiem sory
x=13
y-45=54
y=99
27=z-6
-z=-6-27
-z=-21//*(-1)
z=21
3x-11=2x+2
5x=13// /5
x=2,6
5-2a=9-3a
a=4
5x-3=4x+2
x=5
y-45=54 y=54+45 v=99
a dalszych niewiem