3x+x=81

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Solution for 3x+x=81 equation: 



3x+x=81

We move all terms to the left:

3x+x-(81)=0

We add all the numbers together, and all the variables

4x-81=0

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

4x=81

x=81/4

x=20+1/4

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