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3x+6y-18
-2x+8+2y+2z
2xy-54x
3xpotega do3 -x² +7x
ab+a²-a²b
3x+6y+(-18)
-2x+(-8)+(-2z)
2xy+(-54)
2xsześcian+(-x kwadrat)+7x
ab+a kwadrat+(-a kwadrat b)