$\frac{a^2b}{5}-4ab^2+\frac{7ab^2}{5}-\frac{10a^2b}{11}$
$3m-2n-2nx^4+3mx^4$
$5\cdot0^2$
$2x^2-x-13=2$
$\int\frac{sen\:bx}{1-cos\:bx\:}dx$
$\left(5x-17\right)^2$
$9 ( 5 v - 3 ) + 4 ( 2 v + 5 )$
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