$x y - 21 x = 7 y - 8 x + 9$
$\int\frac{\sqrt{81-16x^2}}{x}dx$
$4x^2-24x=-35$
$m^2+19m+60$
$a+\left[\left(-2a+3b\right)-\left(-a+b-c\right)-c\right]$
$\sin\left(7x+1\right)$
$25d^2-20d+y^2$
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