А) 2x²-(2x²-5x)-(4x-2)=5
2x²-2x²+5x-4x+2=5
5x-4x+2=5
x=5-2
x=3
Б)(y³+y)+(3-6y)-(4-5y)=-2
y³+y+3-6y-4+5y=-2
y³+3-4=-2
y³=-2+4-3
y³=-1
y=-1
В)(x²-7x-11)-(5x²-13x-18)=16-4x²
x²-7x-11-5x²+13x+18=16-4x²
x²-7x-5x²+13x+4x²=16-18+11
6x=9
x=9/6=3/2=1.5
Г)(y²-5y^5-19)-(5y²-6y^5-9)=22-4y²
y²-5y^5-19 -5y²+6y^5+9=22-4y²
y²-5y^5-5y²+6y^5+4y²=22+19-9
y^5=35
y=2