x*3+20=84

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Solution for x*3+20=84 equation: 



x*3+20=84

We move all terms to the left:

x*3+20-(84)=0

We add all the numbers together, and all the variables

x*3-64=0

Wy multiply elements

3x-64=0

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

3x=64

x=64/3

x=21+1/3

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