$\left(x+0.3\right)^2$
$7r-8+2r$
$3.14\cdot8.5^2$
$( 6 x ^ { 2 } - m ^ { 2 } x ) ^ { 2 }$
$9x^2+48x+16$
$6x^3+2x^3$
$147x^2y^2-84xyz+12z^2$
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