$y=\left(7x+1\right)\left(4-x\right)$
$3a^3+2b^2+4a^3-3b^2$
$-1-\left[7-10\right]+5$
$\sin^20\cos^20=1$
$\frac{x^3-19x-7}{x+5}$
$5\left(2-1\right)+6$
$\left(x-7\right)\left(a+9\right)$
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