72-x=3x

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Solution for 72-x=3x equation: 



72-x=3x

We move all terms to the left:

72-x-(3x)=0

We add all the numbers together, and all the variables

-4x+72=0

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

-4x=-72

x=-72/-4

x=+18

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