$x-3y+4z=-4$
$-29-\left(-34\right)$
$3-\left(4-5\right)-4-6+8+9+-\:9+4+3+6+7+8+9$
$\frac{x^2-x-6}{x-3}$
$-3=x-7$
$x^2+\frac{4}{3}x$
$2a+3x+a+5x$
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