1+3*x=7

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Solution for 1+3*x=7 equation: 



1+3*x=7

We move all terms to the left:

1+3*x-(7)=0

We add all the numbers together, and all the variables

3x-6=0

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

3x=6

x=6/3

x=2

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