$2\cdot6+4$
$-19\left(0.5\right)$
$\left(2x^2+\frac{1}{x}\right)^2$
$\int\frac{1+sen\sqrt{x}}{\sqrt{x}}dx$
$-7^2.-7^5.-7^{-4}$
$\left(3m+2n+x\right)^2$
$x+1+x+1+x$
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