$-\frac{7}{9}-\frac{2}{9}$
$4x+5g\cdot4x+5g$
$cos4y-sen4y\:=\:cos2y-sen2y$
$144x^2-192x+64$
$x^2+36x+320$
$4x\:+7\:y\:-\:42\:=\:0\:$
$4x^2-2x=3$
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