-2x-3x=21

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Solution for -2x-3x=21 equation: 



-2x-3x=21

We move all terms to the left:

-2x-3x-(21)=0

We add all the numbers together, and all the variables

-5x-21=0

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

-5x=21

x=21/-5

x=-4+1/5

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