$\left(6z+7\right)+\left(7z+8\right)$
$\sqrt[5]{\left(3x^5-2x^4\right)}^{11}$
$\left(4x^3-6\right)\left(4x^3+6\right)$
$\int-15x^4dx$
$x^2+5x-49$
$3\sqrt{7}+2\sqrt{7}-\sqrt{7}$
$35-167-\left(-87\right)+\left(-35\right)$
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