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x=1-3x-3
x+3x=1-3
4x=-2/:4
x=- 1/2
x=1-3x-3
x+3x=1-3
4x=-2/:4
x=-1/2
x=1-3x-3 | +3x
4x=-2 | :4
x=-2/4
x=-1/2
sprawdzenie:
-1/2=1-3(-1/2+1)
-1/2=1+3/2-3
-1/2=-1/2