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2x+x-3x=4-12
0=-8
b -4x+8=2(4-2x)
-4x+4x=8-8
0=0 nieskonczenie wiele
c 4x-3x-2x=x
-2x
d 2(x-4)=4(x-2)
2x-4x=8+8
-2x=16 /:(-2)
x=-8