$7+2+-79$
$-37+6\cdot7$
$-12=4\left(f-6\right)$
$\frac{2sinx-sin2x}{1-cos2x}=\frac{sinx}{1+cosx}$
$4m+2m+n$
$x^2+1x-76$
$7.8+a>2.3$
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