-20x+13x=21

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Solution for -20x+13x=21 equation: 



-20x+13x=21

We move all terms to the left:

-20x+13x-(21)=0

We add all the numbers together, and all the variables

-7x-21=0

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

-7x=21

x=21/-7

x=-3

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