$\left(7x^5+y^3\:\right)\left(7x^5-y^3\:\right)$
$9y^2-30y+1$
$y'-2y\:=\:xe^{2x}$
$\left(-1-x\right)^2$
$f\left(x\right)\:=\:7\left(3+4x\right)-2x\left(x+2\right)$
$\left(abc-1\right)\left(abc+1\right)$
$6,829+54,3+3,29$
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