3+x+2x-7=8

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Solution for 3+x+2x-7=8 equation: 



3+x+2x-7=8

We move all terms to the left:

3+x+2x-7-(8)=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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