x+3x=3.15

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Solution for x+3x=3.15 equation: 



x+3x=3.15

We move all terms to the left:

x+3x-(3.15)=0

We add all the numbers together, and all the variables

4x-3.15=0

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

4x=3.15

x=3.15/4

x=2.7391304347826/3.4782608695652

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