$16x-20y=-5\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:$
$abc\:x\:cd$
$4x^2-2x-3+6x^2+x-6+2x^2-x+3$
$\frac{\tan\left(23^{\circ}\right)}{\cot\left(23^{\circ}\right)}-\frac{1}{\sin\left(67^{\circ}\right)}$
$-3x^3y\cdot10x^2y$
$-102+-327$
$x^2-2+2$
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