$x\cdot\left(\frac{\left(y\cdot z\cdot a\right)}{\left(b\cdot x+c\cdot d\right)}\right)\cdot b$
$9a^3-81a^2b^4$
$3x-23=4$
$\left(c^2+10d^4\right)^2$
$5\left(x+3\right)x=3$
$x+5=-14$
$2\cot\left(x\right)=\csc^2\left(x\right)$
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