$\frac{x}{7}-7=21$
$\left(2\cdot10-10^3+3\cdot10^2\right)$
$-6+7\cdot\left(-6\right)+\left(4\right)$
$x^{2-6x}$
$\sqrt{3x^2-5x+2}=0$
$\frac{\left(cos\left(10x\right)-cos\left(8x\right)\right)}{sin\left(8x\right)+sin\left(10x\right)}$
$\left(7y^2-6\right)\left(3y^2-10\right)$
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