2.5*x+x=78

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Solution for 2.5*x+x=78 equation: 



2.5x+x=78

We move all terms to the left:

2.5x+x-(78)=0

We add all the numbers together, and all the variables

3.5x-78=0

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

3.5x=78

x=78/3.5

x=22+1/3.5

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