$xy'-5y=0$
$\left(x-1\right)\left(x+2\right)>0$
$0\cdot25b-0\cdot4b+0\cdot2b$
$-\left(-12\right)+7-13\left(-5\right)$
$\frac{1}{2}a-\frac{1}{3}a$
$12-15\left(2-6+10\right)$
$ab-bc+ad-cd$
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