$x^4+8x^2+7$
$\frac{\left(18x^5y^4z^3\right)}{\left(10x^3yz^3\right)}$
$\lim_{x\to\infty}\left(2^x+4\right)$
$\left(3p^2-\frac{3p}{7}\right)^2$
$-300+20$
$6\cdot x+6\cdot7$
$4x-y=-9$
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