$\frac{x+3}{4}=\frac{2x-1}{7}$
$a-9=15$
$-216-\left(+128\right)$
$\left(5x^2-21\right)\left(5x^2+21\right)$
$1-\left(-2-5\right)+\left(3+5+8\right)-6$
$\int\frac{x}{\left(1+x\right)^{\frac{3}{4}}}dx$
$a^xb^n\left(-4a^nb^2\right)$
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