$5\left(3\:-18\:15\:-1\:5\right)$
$5a^4+3a^2+a^4+4a^2$
$x^2+x=-2$
$e^{xy+3y}=6$
$\left(1+2^x\right)^2$
$\frac{x^2-7x+6}{x+1}$
$\frac{3sinx-2cos^2}{2+sinx}=2sinx-1$
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