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-x = 10 I* (-1)
x = -10
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b)3x-11=6x-1
3x-6x = -1+11
-3x=10 I:(-3)
x = - 3/10
x = -0,3
--------------------
c)2*1x+13=5
2x+13=5
2x=5-13
2x=-8 I: 2
x = -4
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I: tzn. dzielimy obustronnie, nie wiem jaki zapis Pani u Was stosowała