uprośc wyrażenia:
x - 2x+3+x-4=
2x-6 +4x+2=
3y-5-5y-6=
x - 2x+3+x-4 = -12x-6 +4x+2 = 6x - 43y-5-5y-6 = -2y -11
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x - 2x+3+x-4 = -1
2x-6 +4x+2 = 6x - 4
3y-5-5y-6 = -2y -11