$4\:sen2x\:=\:3\:-\:4\:sen\:x$
$x^2-35x-75=0$
$-142-893$
$2x+\frac{1}{3}\ge2$
$4a^2b\left(3a-6b\right)$
$9x^2-36x+16$
$\frac{x}{2}+\frac{x}{3}+7=x$
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