$-2\left(-x-3\right)-4x-1=13$
$\left(-4\right)\cdot8\cdot0$
$-4x-36x-72$
$\int14sen\left(x\right)dx$
$25a+25b$
$\int7\left(2x+4\right)^{20}dx$
$\:\:9a^2-25b^2$
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