x.3x+78=81

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Solution for x.3x+78=81 equation: 



x.3x+78=81

We move all terms to the left:

x.3x+78-(81)=0

We add all the numbers together, and all the variables

x.3x-3=0

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

x.3x=3

x=3/1

x=3

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