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Set all numbers and variables equal to zero. (2x3)-(3x2)-(20x)-21=0

Next, follow the order of p.e.m.d.a.s.

6-6-20x-21=0

-20x-21=0

Separate the numbers and variables

-20x=21

x= -21/20

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Polynomial Long Division
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Q: How do I solve this 2x3-3x2-20x-21 equals 0?
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