$6x^4-15x^3-21x^2$
$5x-3y+2z=10$
$4x\cdot\left(x-1\right)+1-3x=x\cdot\left(x-2\right)+1$
$-4\cdot9-7$
$123+89$
$\left(x\:-3\right)\left(x-1\right)\:$
$12x^2+16x+4$
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