1+x+2x=13

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Solution for 1+x+2x=13 equation: 



1+x+2x=13

We move all terms to the left:

1+x+2x-(13)=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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