X+x+3x=12.50

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Solution for X+x+3x=12.50 equation: 



X+X+3X=12.50

We move all terms to the left:

X+X+3X-(12.50)=0

We add all the numbers together, and all the variables

X+X+3X-(12.5)=0

We add all the numbers together, and all the variables

5X-12.5=0

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

5X=12.5

X=12.5/5

X=2+2.5/5

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