$\frac{3x^2y^3+5a^2x^4}{3x^2}$
$21x+6-6$
$\int\frac{\left(x+1\right)^2}{e^x}dx$
$8+x^2-4x^3+5x^2$
$12-2x\:x\:2$
$\sqrt{x}+1=x^2+1$
$6b-2b-3a$
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