$\left(7x^2y+a^3b\right)\left(7x^2y-a^3b\right)$
$6x-30=-6$
$\lim_{x\to0}\left(1-e^x\right)^{\sin\left(x\right)}$
$x^{14}+6x^7+9$
$2\:\left(4x-2\right)$
$-32x+40$
$6b\cdot6b$
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