$5+5\:.\left(-2\right)-18:\left(-2-4\right)$
$1+-3+-3+-7$
$y'+2y=y^2e^x$
$\frac{a^{12}}{a^7}$
$3x-7+7x-6-6x$
$-28-7x=-2\left(7x+7\right)$
$-5x-3-2+3y-4y$
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