[tex]3x=x-(1-(x-3))\\3x=x-(1-x+3)\\3x=x-(-x+1+3)\\3x=x-(-x+4)\\3x=x+x-4\\3x=2x-4\\3x-2x=-4\\\boxed{x=-4}[/tex]
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Proszę, zad w załączniku[tex]3x=x-(1-(x-3))\\3x=x-(1-x+3)\\3x=x-(-x+1+3)\\3x=x-(-x+4)\\3x=x+x-4\\3x=2x-4\\3x-2x=-4\\\boxed{x=-4}[/tex]