Y=(6/x^4)-(3/x)+3x^2-sqrt(x^7)

(6х-1)^2-(3-8x)(3+8x)=(10x+1)^2.
(6x-1)²-(3-8x)(3+8x)-(10x+1)²=0
(6x-1)²+(8x-3)(8x+3)-(10x+1)²=0
(36x²-12x+1)+(8x-3)(8x+3)-(100x²+20x+1)=0
(36x²-12x+1)+(64x²-9)-(100x²+20x+1)=0
36x²-12x+1+64x²-9-100x²-20x-1=0
-32x-9=0
-32x=9
32x=-9
x=(-9)÷32
x=-9/32

5(x+2)^2+(2x-1)^2-9(x+3)(x-3)=22
5(x+2)²+(2x-1)²-9(x+3)(x-3)-22=0
5(x²+4x+4)+(4x²-4x+1)-9(x+3)(x-3)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x+1)-(9x+27)(x-3)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x²-27x+27x-81)-22=0
(5x²+20x+20)+(4x²-4x+1)-(9x²-81)-22=0
5x²+20x+20+4x²-4x+1-9x²+81-22=0
16x+80=0
16x=-80
x=(-80)÷16
x=-5

Выражение: a^3+b*a^2/a-b*a^2-b^2/a^2+2*a*b+b^2*(1/a+1/b)

ответ: a^3+3*b*a-b*a^2-b^2/a^2+b^2/a+b

Решаем по действиям:
1. a^2/a=a
a^2/a=a^(2-1)
1.1. 2-1=1
-2
_1_
1
2. b*a+2*a*b=3*b*a
3. b^2*(1/a+1/b)=b^2/a+b
b^2*(1/a+1/b)=b^2*1/a+b^2*1/b
3.1. b^2/b=b
b^2/b=b^(2-1)
3.1.1. 2-1=1
-2
_1_
1

Решаем по шагам:
1. a^3+b*a-b*a^2-b^2/a^2+2*a*b+b^2*(1/a+1/b)
1.1. a^2/a=a
a^2/a=a^(2-1)
1.1.1. 2-1=1
-2
_1_
1
2. a^3+3*b*a-b*a^2-b^2/a^2+b^2*(1/a+1/b)
2.1. b*a+2*a*b=3*b*a
3. a^3+3*b*a-b*a^2-b^2/a^2+b^2/a+b
3.1. b^2*(1/a+1/b)=b^2/a+b
b^2*(1/a+1/b)=b^2*1/a+b^2*1/b
3.1.1. b^2/b=b
b^2/b=b^(2-1)
3.1.1.1. 2-1=1
-2
_1_
1