$9x^2-12x-4x^2-8x-x^2$
$\left(-4-2y\right)^2$
$21-87-21-43+43$
$-2\cdot1+2$
$\int15x^2\left(5x^3-18\right)^7dx$
$\int\frac{5}{x+3}dx$
$x-4\cdot6x+11$
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