$\left(3x-7y-4z\right)-\left(-3z+4y-7x\right)$
$\left(+54\right)\cdot\left(+11\right)$
$4,6s-0,4s+0,4$
$\left(10m-7y^9\right)^2$
$0.34+6.55555+8.99999$
$\frac { 5 x ^ { 4 } + 6 x ^ { 3 } + 2 x ^ { 2 } + 3 } { x + 1 }$
$2x^2+3x-1^2$
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