x+x+3x+5=12

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Solution for x+x+3x+5=12 equation: 



x+x+3x+5=12

We move all terms to the left:

x+x+3x+5-(12)=0

We add all the numbers together, and all the variables

5x-7=0

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

5x=7

x=7/5

x=1+2/5

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