$4cos\left(2x-30\right)=1$
$6b+60=600$
$\frac{\left(81+x^2\right)}{\left(9+x\right)}$
$\left(-3\right)-\left(-243\right)$
$10x-3=2x+8x-3$
$x-19=-14$
$x^2-18x-10=0$
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