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-y=4/(-1)
y=-4
2y + 2y² +y² - 10- 10y- 5y =-6
-13y +3y² -10 = -6 /+10
-13y +3y² =4
-13y + 9y =4
-4y =4 /: -1
4y=-4
y=1
wydaje mi sie ze dobrze ale nie na 100% jestem pewna