$4-9\:-4-9$
$\int\left(\sqrt{x}+1\right)\left(x-\sqrt{x}+1\right)dx$
$-6+3-2-7\cdot4$
$\left(7a^2b\right).\left(3c^2\right)$
$-5x^2+4x+1=-6x-8$
$16-\left(-60\right)$
$5n+3n-3n$
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