$m^{3-1}r^{3-1}-1^{-2}+m^{3-3}r^{3-3}1^2+1^{-1}$
$\left(x+1\right)^2-\left(x+2\right)^2$
$\left(x+3\right)^2+\left(x-2\right)^2-2x\left(x+1\right)$
$34-\left(-81\right)$
$+23bc-0.3bc$
$-4286-2874$
$\:7x-5=65$
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