$\left(12\:-\:14\right)\:\:\left(1\:+\:6\right)\:$
$7\left(2m\:-\:6\right)\:-\:7\left(2m\:-\:6\right)\:$
$130\:x\:130$
$-500\:-\:400$
$9x^2-6x+1=7$
$\left(4-2cosx\right)^2$
$\frac{\frac{\sin\left(x\right)+1}{\cos\left(x\right)}+1+\sin\left(x\right)}{\frac{\cos\left(x\right)+1}{\sin\left(x\right)}+1+\cos\left(x\right)}$
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