3x(-4)=21

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Solution for 3x(-4)=21 equation: 



3x(-4)=21

We move all terms to the left:

3x(-4)-(21)=0

We multiply parentheses

-12x-21=0

We move all terms containing x to the left, all other terms to the right

-12x=21

x=21/-12

x=-1+3/4

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