$3x+5\left(4x+6\right)$
$4r^2+6r-4$
$5z^2-11z+6$
$u'+u=-e^x$
$\left(12-xy\right)^2$
$-3\:x\:\left(-20:4\right)$
$\int\frac{4x^4-2x+1}{x\left(2x^4+x^3\right)}dx$
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