$\:-\left(x+3\right)^2+6$
$\left(5+6\right)-\left(9+4\right)-\left(-5+6-1+7-5-2+3\right)$
$3x+5=20$
$20z+3-15z$
$\sin\left(90-x\right)=\frac{1-\sin^2x}{\cos x}$
$f\left(x\right)=\left(-8x^5+3x^4+2x^1\right)^7$
$5x^2-9x+9$
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