$l\:\frac{di}{dt}+ri=z$
$35cm\:\cdot3$
$\left(3x+5y\left(3x-5y\right)$
$\left(3x^2-ab\right)^2$
$\left(2x-1\right)\left(-x^{2}-5\right)\left(x^{3}-1\right)$
$\frac{124}{-4}$
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