$4y^2-8y-15=0$
$\frac{4a^{-2}b^4}{a^9b^3}$
$x+3xy-6x-2x+8xy+y-2xy+4y$
$x^2+12x+4$
$sinx+sin4x=0$
$5\:x\:=\:20$
$\left(4x^10\right)\left(9x^3\right)$
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