$+3-4+2-7+4-6-8+1$
$2y+1+\left(-4y\right)+7$
$15-4\cdot6-8$
$\left(a+b\right)^3-\left(a-b\right)^2$
$\sqrt[4]{\frac{100}{50}-6^0}$
$4z^36z^2-6z+9\:$
$\left(-3x^2+6\right)\left(-3x^2-6\right)$
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