$\frac{2x+6}{2}-x=3$
$\int\sec^5\left(2x\right)dx$
$2\sqrt{12}-3\sqrt{75}+\sqrt{27}$
$x^2=y-18$
$\frac{25y^4-1}{5y^2+1}$
$\left(-12\right)\left(-8\right)+7$
$6x^3+2x^3$
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