$a+7b=23$
$\left(6+4\right)-\left(-3-2+5\right)$
$\:\left(-54\right)\:-\:\left(-32\right)$
$\left(+85\right)\:x\:\left(+45\right)$
$-x^2-2\left(5x+8\right)+\left(x+5\right)^2$
$\frac{dy}{dx}xy-3x+4x^2=7$
$\left(7\right)^4$
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