21-6x=-69

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Solution for 21-6x=-69 equation: 



21-6x=-69

We move all terms to the left:

21-6x-(-69)=0

We add all the numbers together, and all the variables

-6x+90=0

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

-6x=-90

x=-90/-6

x=+15

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