$\left(x^{a-1}-3^x\right)^2$
$2n-7\left(8-3n\right)+6$
$\sqrt{40-x^2}+4=x$
$15x\:-\:30y\:$
$t\frac{dx}{dt}+4t=t^3-t$
$\int\cot\frac{y}{3}dy$
$x^2-10x+16=0$
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