$7x+3y+4\left(-3x+4y\right)$
$217\cdot9$
$-7m^2+8m-5m^2$
$2x^2=8x+64$
$\left(13x^7-3\right)\left(13x^7+3\right)$
$\left(2y+1\right)tanx$
$x-10<30$
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