$x\:-\:3x^2\:+4x\:-3x^2$
$.5m+.25=\frac{1}{2}$
$-\frac{dy^2}{dx^2}+w^2x=0$
$\frac{4x+8x-12}{4x}$
$a-b+a+b$
$9y\left(y+x\right)-10+5x$
$3x^2+17x+20$
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