$4x+2y=70$
$x^2+4x-6=0$
$-a+\frac{3}{11}a$
$72x^8+36x^9+\frac{108x^{10}}{-12x^6}$
$\left(5x^2+1\right)^2\left(10x\right)$
$18.4-6.05$
$m^2-7m+12=0$
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