x+x+x+3x=15

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Solution for x+x+x+3x=15 equation: 



x+x+x+3x=15

We move all terms to the left:

x+x+x+3x-(15)=0

We add all the numbers together, and all the variables

6x-15=0

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

6x=15

x=15/6

x=2+1/2

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