$\frac { 3 x ^ { 4 } - 5 x ^ { 2 } + 2 } { 3 + x ^ { 3 } }$
$7.08+2.45+15.220$
$3x^2-4x^2+x\cdot x+x^2$
$8x-16-7x-21$
$4x^3y^2-12x^2y^3+17xy$
$3x\:+\:5\:\le\:-7x\:-\:8$
$6^5\cdot6^2\cdot6$
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