78-2xx=12

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Solution for 78-2xx=12 equation: 



78-2xx=12

We move all terms to the left:

78-2xx-(12)=0

We add all the numbers together, and all the variables

-2xx+66=0

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

-2xx=-66

x=-66/1

x=-66

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