$42^2-38^2$
$-99\cdot31+-1\cdot31$
$\frac{9x^5-3x^3-6x+12}{3x}$
$-6mn+9$
$\:\:\:\:\:\:\:\:\:\:\:-1\:\:\:\:\:-\:\left(\:-15\right)\:\:\:+\:\:\left(-4\right)$
$\frac{dy}{dt}\:+\:\frac{y}{2}=2+t$
$3.03125\cdot0.33$
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