$$21 { x }^{ 5 } +24 { x }^{ 4 } -10 { x }^{ 3 } +0 { x }^{ 2 } +42x-12 \div 2x-2$$
$21x^{5}+24x^{4}-10x^{3}+36x-2$
$$21x^{5}+24x^{4}-10x^{3}+0+42x-\frac{12}{2}x-2$$
$$21x^{5}+24x^{4}-10x^{3}+42x-\frac{12}{2}x-2$$
$$21x^{5}+24x^{4}-10x^{3}+42x-6x-2$$
$$21x^{5}+24x^{4}-10x^{3}+36x-2$$
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$105x^{4}+96x^{3}-30x^{2}+36$
