$2sin2x-4sinx=0$
$\frac{x}{5}-4=6$
$\frac{4x-5}{7}<x+1$
$\left(4d-13\right)\left(4d+13\right)$
$7m\left(7m^2-6mn+2n^2\right)$
$4x^2-12x+9ufwu$
$2x+7\cdot2x+0$
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