Уровень 1

\(3 x-2(x+1)-4(5-3 x)=4\)

\(\dfrac{x+2}{1-3 x}=1\).

\(\dfrac{6}{2 x-11}=\dfrac{3}{x+5}\)

\(x^2-10 x+21=0\).

\(x^2-2(x+3)=2\)

\(x(x+8)=12(x+1)\).

\((x-1)\left(3 x^2+2 x-1\right)=0\).

\(\left(4 x^2+4 x+1\right)(x+3)=(x-2)(1+2 x)\)

\(x+\dfrac{5}{x}+6=0\)

\(x+\dfrac{1}{x}=2,5\)

\(\left(7 x^2-6 x\right)^2=1\)

\(\dfrac{5}{36}-\dfrac{(x+3)^2}{5}=0\).

\(\dfrac{2 x+1}{2 x^2+3 x+1}=1\).

Уровень 2

\(\left(x^2-25\right) \sqrt{6-2 x}=0\)

\(\sqrt{x-2}=\sqrt{2 x-1}\)