$9y^2-16y+1$
$\left(-6\right)\:+\:\left(-5\right)\:-\:\left(-7\right)\:+\:4$
$4\left(3-x\right)+2x+3$
$6y^3+2y^3$
$x^3+x-1\cdot2x-1$
$15t\:-6h\:+4h\:-15t$
$x^2-x+6$
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