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= 4c -(-x-(-x +3-x-2)) =
= 4c -(-x - (-2x +1))=
= 4c -(-x +2x -1) =
= 4c -( x -1)=
= 4c -x +1
=4c-(-x+2x-1)=4c-(x-1)=4c-x+1
jeśli na początku ma być 4x, to mamy wynik 4x-x+1=3x+1
4c-(-x-(-x+3-x-2))=
4c-(-x+x-3+x+2)=
4c+x-x+3-x-2=
4c-x+1