$7<8x-5$
$\left(10x-8y\right)\left(10x+8y\right)$
$5b-7b$
$\cos\left(x\right)=0.9$
$\int_0^xsen3dx$
$\csc\left(y\right)dx+\sec\left(2x\right)dy=0$
$x\left(y-3\right)y'=5y$
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