$4x^2-4x=32x$
$\frac{2}{\pi}\int_0^{\pi}xsin\left(xn\right)dx$
$9x+9=900$
$\int4^{3x+2}dx$
$4a^2+36a+81$
$\left(2a+ab2^{n-2}\right)^3$
$\int\:5x\sqrt{x-12}\:dx$
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