$7d+4d$
$\left(\left(-3+9\right).\:\left(-32:-8\right)\:=\:10\right)\:\left(-9+6\right).\left(-2-5\right)$
$2x^2-8+10$
$\left(-1\right)^5+\left(-1\right)^4+2\left(-1\right)^3-5\left(-1\right)^2+3\left(-1\right)-9$
$6x+31=55$
$\left(x^3+x^2+x+1\right)^3$
$2x^2\:-\:7\:=\:9$
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