$\left(+4\right)\left(-2\right)+4$
$3x-12x+15x^3y$
$5=3x^2-12x+9$
$\int\sqrt{x^2+7}5xdx$
$1-6x-9x^2$
$3x^3-2x^2+3x$
$\sqrt{640}$
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