3x+x=12.50

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Solution for 3x+x=12.50 equation: 



3x+x=12.50

We move all terms to the left:

3x+x-(12.50)=0

We add all the numbers together, and all the variables

3x+x-(12.5)=0

We add all the numbers together, and all the variables

4x-12.5=0

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

4x=12.5

x=12.5/4

x=3+0.5/4

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