10(4x-1)=68+14x
(1+3–√3)3−3(1+3–√3)2+2(1+3–√3)−1
f(1+3–√3)
f(1+3–√3)=(1+3–√3)3−3(1+3–√3)2+2(1+3–√3)−1
20=9 80=x find x
2(x+3)=x-4
13(-2-11n)=-26+2n
∫
0
2π
π/4
π
2
ρ
4
1
sinϕdρdϕdθ.