99-13x=21

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Solution for 99-13x=21 equation: 



99-13x=21

We move all terms to the left:

99-13x-(21)=0

We add all the numbers together, and all the variables

-13x+78=0

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

-13x=-78

x=-78/-13

x=+6

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